UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q
                                   (Mark One)
[X] Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange
    Act of 1934

                For the quarterly period ended: December 31, 2002

                                       or

[ ] Transition Report Pursuant to Section 13 or 15(d) of the Securities
    Exchange Act of 1934

                        For the transition period from to

                          Commission File Number 0-9992

                             KLA-Tencor Corporation
             (Exact name of registrant as specified in its charter)

                               Delaware 04-2564110
                               -------- ----------
                (State or other jurisdiction of (I.R.S. Employer
               incorporation or organization) Identification No.)


                                 160 Rio Robles
                              San Jose, California
                                      95134
                    (Address of principal executive offices)
                                   (Zip Code)

                                 (408) 875-3000
              (Registrant's telephone number, including area code)


- --------------------------------------------------------------------------------


         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

                                  Yes [X] No_____



         As of January 31, 2003 there were 190,203,282 shares of the
Registrant's Common Stock, $0.001 par value, outstanding.




                                      INDEX

                                                                                                   
                                                                                                       Page
                                                                                                     Number
PART I           FINANCIAL INFORMATION

Item 1           Financial Statements (unaudited)

                    Condensed Consolidated Unaudited Balance Sheets at
                    December 31, 2002 and June 30, 2002 ............................................       3

                    Condensed Consolidated Unaudited Statements of Operations
                    for the Three and Six Months Ended December 31, 2002 and 2001...................       4

                    Condensed Consolidated Unaudited Statements of Cash Flows
                    for the Six Months Ended December 31, 2002 and 2001.............................       5

                    Notes to Condensed Consolidated Unaudited Financial Statements..................       6


Item 2           Management's Discussion and Analysis of Financial Condition
                 and Results of Operations..........................................................      18


Item 3           Quantitative and Qualitative Disclosures About Market Risk.........................      31

Item 4           Controls and Procedures............................................................


PART II          OTHER INFORMATION

Item 1           Legal Proceedings..................................................................      33

Item 4           Submission of Matters to a Vote of Security Holders                                      34

Item 6           Exhibits and Reports on Form 8-K...................................................      34


SIGNATURES            ..............................................................................      35
- ----------

CERTIFICATIONS        ..............................................................................      36
- --------------














                          PART I. FINANCIAL INFORMATION

ITEM 1.     FINANCIAL STATEMENTS


                             KLA-TENCOR CORPORATION
                      Condensed Consolidated Balance Sheets
                                   (Unaudited)


                                                                          December 31,             June 30,
(in thousands)                                                                 2002                  2002
- ------------------------------------------------------------------------------------------------------------
                                                                                         
ASSETS

Current assets:
   Cash and cash equivalents                                             $     530,595         $     429,820
   Marketable securities                                                       275,052               243,526
   Accounts receivable, net                                                    257,561               277,006
   Inventories                                                                 289,956               323,016
   Other current assets                                                        355,717               345,920
- ------------------------------------------------------------------------------------------------------------
         Total current assets                                                1,708,881             1,619,288

Land, property and equipment, net                                              400,367               300,560
Marketable securities                                                          503,574               660,237
Other assets                                                                   138,024               137,633
- ------------------------------------------------------------------------------------------------------------
         Total assets                                                    $   2,750,846         $   2,717,718
============================================================================================================

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                                      $      22,947         $      52,988
   Deferred profit                                                             177,851               193,852
   Unearned revenue                                                             49,734                54,886
   Other current liabilities                                                   400,513               385,764
- ------------------------------------------------------------------------------------------------------------
         Total current liabilities                                             651,045               687,490
- ------------------------------------------------------------------------------------------------------------

Commitments and contingencies (Note 6)

Stockholders' equity:
   Common stock and capital in excess of par value                             751,413               765,946
   Retained earnings                                                         1,340,188             1,259,695
   Accumulated other comprehensive income                                        8,200                 4,587
- ------------------------------------------------------------------------------------------------------------
         Total stockholders' equity                                          2,099,801             2,030,228
- ------------------------------------------------------------------------------------------------------------
         Total liabilities and stockholders' equity                      $   2,750,846         $   2,717,718
============================================================================================================

See accompanying notes to condensed consolidated financial statements.







                             KLA-TENCOR CORPORATION
                 Condensed Consolidated Statements of Operations
                                   (Unaudited)


                                                               Three months ended             Six months ended
                                                                 December 31,                   December 31,
(in thousands, except per share data)                            2002         2001           2002          2001
- ---------------------------------------------------------------------------------------------------------------
                                                                                          

Revenue:
      Product                                              $  268,075   $  354,608      $ 580,583     $ 809,004
      Service                                                  66,843       49,540        129,855        97,976
- ---------------------------------------------------------------------------------------------------------------
         Total revenue                                     $  334,918      404,148        710,438       906,980
- ---------------------------------------------------------------------------------------------------------------

Costs and operating expenses:
Costs of goods sold                                           171,138      201,811        357,482       446,179
Research and development                                       71,935       74,061        142,788       146,984
Selling, general and administrative                            65,089       71,996        135,530       153,244
Non-recurring acquisition, restructuring
 and other, net                                                    --           --         (9,402)           --
- ---------------------------------------------------------------------------------------------------------------
         Total costs and operating expenses                   308,162      347,868        626,398       746,407
- ---------------------------------------------------------------------------------------------------------------

Income from operations                                         26,756       56,280         84,040       160,573

Interest income and other, net                                 11,702       10,001         21,872        22,553
- ---------------------------------------------------------------------------------------------------------------

Income before income taxes                                     38,458       66,281        105,912       183,126

Provision for income taxes                                      9,230       17,233         25,419        47,613
- ---------------------------------------------------------------------------------------------------------------

Net income                                                 $   29,228   $   49,048      $  80,493     $ 135,513
===============================================================================================================


Earnings per basic share:

     Net income                                            $     0.15   $     0.26      $    0.43     $    0.72
                                                           ====================================================

Earnings per diluted share:

     Net income                                            $     0.15   $     0.25      $    0.42     $    0.70
                                                           ====================================================


Weighted average number of shares:
Basic                                                        189,018       186,200        189,229       186,928
                                                           ====================================================
Diluted                                                      193,519       194,637        193,904       194,855
                                                           ====================================================



See accompanying notes to condensed consolidated financial statements.






                             KLA-TENCOR CORPORATION
                 Condensed Consolidated Statements of Cash Flows
                                   (Unaudited)
                                                                                          Six Months Ended
                                                                                            December 31,
(in thousands)                                                                         2002            2001
- --------------------------------------------------------------------------------------------------------------
                                                                                             
Cash flows from operating activities:
   Net income                                                                   $   80,493         $   135,513
   Adjustments to reconcile net income to net cash
      provided by operating activities:
        Depreciation and amortization                                               35,434              33,345
        Deferred income taxes                                                           --              (2,645)
        Non-recurring acquisition, restructuring
         and other, net                                                             (9,402)                 --
        Net (gain) loss on sale of marketable securities                            (8,677)              1,077
        Changes in assets and liabilities:
              Accounts receivable, net                                              19,446              36,590
              Inventories                                                           33,057              58,975
              Other assets                                                         (11,139)            (14,318)
              Accounts payable                                                     (30,039)            (18,195)
              Deferred profit                                                       16,001            (130,290)
              Other current liabilities                                            (27,265)            (44,708)
- ---------------------------------------------------------------------------------------------------------------
              Net cash provided by operating activities                             97,909              55,344
- --------------------------------------------------------------------------------------------------------------

Cash flows from investing activities:
   Purchase of land, property and equipment, net                                  (126,155)            (50,776)
   Cash paid for acquisition                                                            --              (4,035)
   Purchase of marketable securities                                              (799,620)           (783,564)
   Proceeds from sale of marketable securities                                     892,439             552,104
   Proceeds from maturity of marketable securities                                  49,468              84,478
- --------------------------------------------------------------------------------------------------------------
              Net cash provided (used) in investing activities                      16,132            (201,793)
- --------------------------------------------------------------------------------------------------------------

Cash flows from financing activities:
   Issuance of common stock                                                         33,826              34,161
   Stock repurchases                                                               (48,359)           (110,812)
   Net payments under short-term debt obligations                                       --                (499)
- ---------------------------------------------------------------------------------------------------------------
              Net cash used in financing activities                                (14,533)            (77,150)
- ---------------------------------------------------------------------------------------------------------------

Effect of exchange rate changes on cash
    and cash equivalents                                                             1,267              (3,059)
- ---------------------------------------------------------------------------------------------------------------

Net increase (decrease) in cash and cash equivalents                               100,775            (226,658)

Cash and cash equivalents at beginning of period                                   429,820             529,674
- --------------------------------------------------------------------------------------------------------------
Cash and cash equivalents at end of period                                      $  530,595         $   303,016
==============================================================================================================
Supplemental cash flow disclosures:
   Income taxes (refunded) paid, net                                            $   (2,924)        $   (16,136)
                                                                                ===========        ===========
   Interest paid                                                                $      142         $       428
                                                                                ===========        ===========

See accompanying notes to condensed consolidated financial statements.








                             KLA-TENCOR CORPORATION
              Notes to Condensed Consolidated Financial Statements
                                   (Unaudited)

NOTE 1 - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Basis of presentation The condensed  consolidated financial statements have
been prepared by KLA-Tencor Corporation ("KLA-Tencor" or the "Company") pursuant
to the rules and regulations of the Securities and Exchange  Commission ("SEC").
Certain  information  and footnote  disclosures  normally  included in financial
statements prepared in accordance with accounting  principles generally accepted
in the United States of America have been condensed or omitted  pursuant to such
rules and  regulations.  In the opinion of  management,  the  unaudited  interim
financial  statements  reflect  all  adjustments  (consisting  only  of  normal,
recurring  adjustments)  necessary  for a fair  presentation  of  the  financial
position,  results of operations and cash flows for the periods indicated. These
financial statements and notes, however,  should be read in conjunction with the
Item 8, "Financial  Statements and Supplementary Data" included in the Company's
Annual  Report on Form 10-K for the fiscal year ended June 30, 2002,  filed with
the SEC on September 20, 2002.

     The results of operations  for the three and six months ended  December 31,
2002 are not necessarily  indicative of the results that may be expected for any
other interim period or for the full fiscal year ending June 30, 2003.

     Fair Value of Financial Instruments  KLA-Tencor has evaluated the estimated
fair value of financial  instruments  using  available  market  information  and
valuation  methodologies.   The  use  of  different  market  assumptions  and/or
estimation  methodologies  could have a significant effect on the estimated fair
value amounts.  The fair value of KLA-Tencor's cash, cash equivalents,  accounts
receivable,  accounts  payable and other current  liabilities  approximates  the
carrying amount due to the relatively short maturity of these items.

     Marketable  Securities  Short-term  marketable  securities include debt and
equity securities acquired with maturities  exceeding three months but less than
one year from the date of acquisition. Non-current marketable securities include
debt  securities  acquired with  maturities  exceeding one year from the date of
acquisition.  While KLA-Tencor's  intent is to hold debt securities to maturity,
KLA-Tencor has classified all debt securities as available-for-sale, as the sale
of such  securities  may be required  prior to maturity to implement  management
strategies.  Such  securities  are  reported at fair value  determined  based on
quoted  market  prices  at  the  reporting  date  for  those  instruments,  with
unrealized  gains and losses excluded from earnings and included in "Accumulated
other comprehensive income," net of applicable taxes, until realized. KLA-Tencor
has classified some equity securities that have readily determinable fair values
in a  similar  manner.  The cost of  securities  sold is  based on the  specific
identification  method.  Realized gains or losses and declines in value, if any,
judged to be other than  temporary  are reported in "Interest  income and other,
net" in the Condensed  Consolidated  Statements of  Operations.  Certain  equity
securities have been classified as trading securities.  These trading securities
are  reported  at fair value  determined  based on quoted  market  prices at the
reporting date for those  instruments,  with unrealized gains or losses included
in earnings for the applicable  period.  The net amount of such gains and losses
for the three months and six months ended  December 31, 2002 were not  material.
As of  December  31,  2002,  the fair value of the  trading  securities  was $11
million.

     Intangible  Assets Purchased  technology,  patents,  trademarks,  favorable
leases and goodwill  are  presented at cost,  net of  accumulated  amortization.
Effective July 1, 2001,  KLA-Tencor  replaced  ratable  amortization of goodwill
with  periodic  testing  of  goodwill  for  impairment  in  accordance  with the
provision of Statement of Financial  Accounting  Standard No. 142, "Goodwill and
Intangible  Assets."  Intangible  assets other than goodwill are amortized  over
their estimated useful lives using the straight-line method.

     Impairment of Long-Lived Assets KLA-Tencor  evaluates the carrying value of
its long-lived assets whenever events or changes in circumstances  indicate that
the  carrying  value  of the  asset  may be  impaired  in  accordance  with  the
provisions of Statement of Financial  Accounting  Standard No. 121,  "Accounting
for the Impairment of Long-Lived  Assets." An impairment loss is recognized when
estimated  future  cash  flows  expected  to  result  from the use of the  asset
including disposition is less than the carrying value of the asset.

     Concentration  of Credit  Risk  Financial  instruments,  which  potentially
subject KLA-Tencor to credit risk, consist principally of investments,  accounts
receivable and derivative financial instruments used in hedging activities.

     Investments  are  maintained  with  high-quality   institutions,   and  the
composition and maturities of investments are regularly monitored by management.
Generally,  these  securities  are  traded  in a highly  liquid  market,  may be
redeemed upon demand and bear minimal risk.  KLA-Tencor,  by policy,  limits the
amount of credit exposure to any one financial institution or commercial issuer.
KLA-Tencor has not experienced any material losses on its investments.

     A majority of  KLA-Tencor's  trade  receivables  are derived  from sales to
large   multinational   semiconductor   manufacturers   throughout   the  world.
Concentration of credit risk with respect to trade  receivables is considered to
be limited due to its customer  base and the diversity of its  geographic  sales
areas.   KLA-Tencor  performs  ongoing  credit  evaluations  of  its  customers'
financial condition.  KLA-Tencor maintains a reserve for potential credit losses
based upon expected collectibility of all accounts receivable.

     KLA-Tencor  is exposed  to credit  loss in the event of  nonperformance  by
counterparties  on the foreign  exchange  contracts used in hedging  activities.
KLA-Tencor does not anticipate nonperformance by these counterparties.

     Warranty  KLA-Tencor provides standard warranty coverage on its systems for
twelve months,  providing labor and parts necessary to repair the systems during
the warranty period.  KLA-Tencor  accounts for the estimated  warranty cost as a
charge to cost of sales when revenue is recognized.  The estimated warranty cost
is based on historical product performance and field expenses.  Utilizing actual
service  records,  KLA-Tencor  calculates  the average  service  hours and parts
expense per system and applies the actual labor and overhead  rates to determine
the estimated warranty charge.  KLA-Tencor updates these estimated charges every
quarter.  The actual  product  performance  and/or  field  expense  profiles may
differ, and in those cases KLA-Tencor adjusts warranty accruals accordingly. The
following table shows the details of the product warranty  accrual,  as required
by  Financial  Accounting  Standards  Board  ("FASB")   Interpretation  No.  45,
"Guarantor's  Accounting and Disclosure  Requirements for Guarantees,  Including
Indirect  Guarantees  of  Indebtedness  of Others,"  for the three  months ended
December 31, 2002:



                                                                                       Amount of
                                                                                       Liability
(in thousands)                                                                     Debit/(Credit)
- -------------------------------------------------------------------------------------------------
                                                                                   

Balance at September 30, 2002                                                         $   (42,762)
Accruals for warranties issued during the period                                          (12,638)
Changes in liability related to pre-existing warranties                                     5,283
Settlements made during the period                                                         11,570
- -------------------------------------------------------------------------------------------------
Balance at December 31, 2002                                                          $   (38,547)
=================================================================================================


     Revenue  Recognition  In December  1999,  the SEC issued  Staff  Accounting
Bulletin ("SAB") No. 101, "Revenue Recognition in Financial Statements." The SEC
Staff  addressed  several  issues in SAB 101,  including  the  timing of revenue
recognition for sales that involve contractual  customer  acceptance  provisions
and  installation  of the  product if these  events  occur  after  shipment  and
transfer  of title.  KLA-Tencor  implemented  the  provisions  of SAB 101 in the
fourth fiscal quarter of 2001, retroactive to July 1, 2000. Prior to adoption of
SAB 101, KLA-Tencor's general policy was to recognize revenue on shipment.

     KLA-Tencor  derives  revenue from four sources - system  sales,  spare part
sales,  service  contracts  and software  license  fees.  System  sales  include
hardware and software that is  incidental to the product.  SAB 101 has no impact
on  KLA-Tencor's  revenue  recognition  policy  for spare  part  sales,  service
contracts and software license fees.

     Prior  to the  implementation  of SAB 101,  system  revenue  was  generally
recognized upon shipment.  Effective July 1, 2000, KLA-Tencor changed its method
of accounting  for system sales to generally  recognize  revenue upon a positive
affirmation  by the customer that the system has been installed and is operating
according to predetermined specifications.  In certain limited cases, KLA-Tencor
may deviate from the need for a written acceptance by the customer, as follows:
o                 When  system  sales to  independent  distributors  have no
                  installation, contain no acceptance agreement, and 100%
                  payment is due upon shipment, revenue is recognized on
                  shipment;
o                 When the system requires no integration and installation is
                  inconsequential, revenue is recognized on shipment. In these
                  cases KLA-Tencor is required to perform the installation but
                  KLA-Tencor considers installation not essential to the
                  functionality of the equipment, and there are no additional
                  tests required to be performed on-site. In addition, third
                  party distributors and customers regularly complete the
                  installation of these tools;
o                 When the customer fab has already accepted the same tool, with
                  the same specifications on the same process, for the same
                  application, and it can be objectively demonstrated that it
                  meets all of the required acceptance criteria upon shipment, a
                  portion of revenue can be recognized at the time of shipment.
                  Revenue recognized upon shipment is exclusive of the amount
                  allocable to the installation element. Revenue attributable to
                  the installation element is the higher of the payment amount
                  due upon acceptance or the fair value of installation;
o                 When the system is performing in production and meets all
                  published and contractually agreed specifications, but the
                  customer withholds signature on our acceptance document due to
                  warranty or other issues unrelated to product performance;
o                 When the system is damaged during transit, revenue is
                  recognized upon receipt of cash payment from the customer.

     Total revenue  recognized under  conditions where KLA-Tencor  deviates from
the need for a written  acceptance  by the customer were less than 3.5% and 3.0%
of total  revenue for the three months and six months  ended  December 31, 2002,
respectively,  compared with 2.5% of total revenue for each of the three and six
months ended December 31, 2001, respectively.

     In accordance  with SAB 101,  KLA-Tencor  also allows for multiple  element
revenue  arrangement in cases where certain elements of a sales contract are not
delivered  and accepted at the same time. In such cases,  KLA-Tencor  defers the
fair value of the  unaccepted  element  until that  element is  delivered to and
accepted by the customer.  To be considered a separate  element,  the product or
service in question  must  represent  a separate  earnings  process,  and is not
essential to the functionality of the delivered and accepted portion of the same
sales contract.  If the unaccepted  element is essential to the functionality of
the delivered and accepted  portion,  the whole amount of the sales  contract is
deferred until all elements are accepted.

     Spare parts revenue is recognized  when the product has been shipped,  risk
of loss has passed to the customer and collection of the resulting receivable is
probable.

     Service and maintenance  revenue is recognized ratably over the term of the
maintenance  contract.  If  maintenance  is  included in an  arrangement,  which
includes a software  license  agreement,  amounts  related  to  maintenance  are
allocated based on vendor specific  objective  evidence.  Non-standard  warranty
includes  services  incremental  to the standard  40-hour per week  coverage for
twelve  months.  Non-standard  warranty is  deferred as unearned  revenue and is
recognized  ratably  as  revenue  when  the  applicable   warranty  term  period
commences.  Consulting  and  training  revenue is  recognized  when the  related
services are performed.

     Revenue from software license fees is typically recognized upon shipment if
collection  of the  resulting  receivable  is  probable,  the  fee is  fixed  or
determinable,  and  vendor-specific  objective  evidence  exists to  allocate  a
portion of the total fee to any undelivered  elements of the  arrangement.  Such
undelivered elements in these arrangements  typically consist of services and/or
upgrades.  If  vendor-specific   objective  evidence  does  not  exist  for  the
undelivered  elements of the  arrangement,  all  revenue is deferred  until such
evidence does exist, or until all elements are delivered,  whichever is earlier.
In instances  where an  arrangement  to deliver  software  requires  significant
modification or customization,  license fees are recognized under the percentage
of completion  method of contract  accounting.  Allowances are  established  for
potential product returns and credit losses. To date,  revenue from license fees
have been less than 10% of total revenue.

     As a result of  implementing  SAB 101,  KLA-Tencor  changed  its  method of
accounting for revenue recognition.  This change resulted in cumulative deferred
revenue of $660.9  million as of July 1, 2000,  which was recorded as a non-cash
charge of $306.4 million (after reduction for product and warranty costs of $207
million and income taxes of $147.5  million).  The deferred profit balance as of
December 31, 2002 was $178 million and equals the amount of system  revenue that
was  invoiced and due on shipment  but  deferred  under SAB 101 less  applicable
product  and  warranty   costs.   KLA-Tencor  also  defers  the  fair  value  of
non-standard  warranty  bundled with equipment  sales as unearned  revenue.  The
unearned  revenue  balance as of  December  31,  2002 and June 30,  2002 was $50
million and $55 million,  respectively.  Strategic Development  Agreements Gross
engineering, research and development expenses were partially offset by external
funding received under certain  strategic  development  programs  conducted with
several of our customers and government  grants.  The Company received  external
funding  of $4  million  and $10  million  for the  three and six  months  ended
December 31, 2002,  respectively,  compared to $3 million and $6 million for the
three and six months ended December 31, 2001, respectively.

     Earnings  Per Share  Basic  earnings  per share  ("EPS") is  calculated  by
dividing net income  available to common  stockholders  by the weighted  average
number of common  shares  outstanding  during the period.  Diluted  earnings per
share is  calculated  by using the  weighted  average  number  of common  shares
outstanding  during the period and gives effect to all dilutive potential common
shares  outstanding  during the period.  The reconciling  difference between the
computation of basic and diluted earnings per share for all periods presented is
the inclusion of the dilutive  effect of stock options issued to employees under
employee stock option plans.

     During the three months and six months ended December 31, 2002,  options to
purchase approximately 6,358,394 shares and 5,869,964 shares,  respectively,  at
prices  ranging from $37.05 to $68.00,  were not included in the  computation of
diluted EPS because the exercise price was greater than the average market price
of common  shares.  During the three  months and six months  ended  December 31,
2001, options to purchase approximately  10,875,333 shares and 4,580,198 shares,
respectively,  at prices  ranging from $33.75 to $68.00 were not included in the
computation  of diluted  EPS  because the  exercise  price was greater  than the
average market price of common shares.

     Accounting for Stock-Based  Compensation Plans: KLA-Tencor accounts for its
employee stock option and employee  stock  purchase plans under the  recognition
and measurement principles of APB Opinion No. 25, Accounting for Stock Issued to
Employees, and related Interpretations. No stock- based employee compensation is
reflected  in net  income,  as all  options  granted  under  those  plans had an
exercise price equal to the market value of the  underlying  common stock on the
date of grant.

     Reclassifications  Certain prior year balances  have been  reclassified  to
conform to the current financial statement presentation. These reclassifications
had no impact on previously  reported  results of  operations  or  stockholders'
equity.

     Recent  Accounting   Pronouncements   KLA-Tencor   adopted  SFAS  No.  143,
"Accounting for Obligations Associated with the Retirement of Long-Lived Assets"
and SFAS No. 144  "Accounting  for the  Impairment  of  Disposal  of  Long-Lived
Assets".  SFAS No. 143 establishes  accounting standards for the recognition and
measurement  of  an  asset  retirement   obligation  and  its  associated  asset
retirement cost. It also provides guidance for legal obligations associated with
the retirement of tangible  long-lived assets. SFAS No. 144 establishes a single
accounting model for the impairment or disposal of long-lived assets,  including
discontinued  operations.  Adoption  of  these  pronouncements  did  not  have a
significant effect on our consolidated financial statements.

     In June 2002, the FASB issued  Statement No. 146 ("SFAS 146"),  "Accounting
for Costs  Associated  with Exit or  Disposal  Activities."  SFAS 146  addresses
financial  accounting and reporting for costs  associated  with exit or disposal
activities,  and  nullifies  Emerging  Issues Task Force  (EITF) Issue No. 94-3,
Liabilities  Recognition  for Certain  Employee  Termination  Benefits and Other
Costs to Exit an Activity (including Certain Costs Incurred in a Restructuring).
This Statement  requires that a liability for costs  associated  with an exit or
disposal  activity be recognized and measured  initially at fair value only when
the  liability  is  incurred.  SFAS 146 will be  effective  for exit or disposal
activities  that are  initiated  after  December 31, 2002.  The standard will in
certain circumstances change the timing of recognition of restructuring costs.

     In November 2002, the Emerging Issues Task Force (EITF) reached a consensus
on  Issue  No.  00-21,   "Accounting  for  Revenue  Arrangements  with  Multiple
Deliverables."  This issue  addresses  determination  of whether an  arrangement
involving  more than one  deliverable  contains more than one unit of accounting
and how  arrangement  consideration  should be  measured  and  allocated  to the
separate units of accounting. EITF Issue No. 00-21 will be effective for revenue
arrangements entered into in fiscal periods beginning after June 15, 2003 or the
Company  may elect to report the  change in  accounting  as a  cumulative-effect
adjustment.  The  Company  is  reviewing  EITF  Issue No.  00-21 and has not yet
determined the impact this issue will have on its consolidated operating results
and financial position.

     In December 2002, FASB issued  Statement No. 148 ("SFAS 148"),  "Accounting
for Stock-Based  Compensation Transition and Disclosure".  This Statement amends
FASB Statement No. 123 ("SFAS 123"); "Accounting for Stock-Based  Compensation",
to provide  alternative  methods of  transition  for an entity that  voluntarily
changes to the fair value based method of accounting  for  stock-based  employee
compensation.  It also amends the  disclosure  provisions  of that  Statement to
require  prominent  disclosure  about the effects on  reported  net income of an
entity's  accounting  policy  decisions  with  respect to  stock-based  employee
compensation.  Finally,  this  Statement  amends APB  Opinion  No.  28,  Interim
Financial  Reporting,  to  require  disclosure  about  those  effects in interim
financial information. Since KLA-Tencor is continuing to account for stock-based
compensation  according to APB 25, adoption of SFAS 148 will require  KLA-Tencor
to provide  prominent  disclosures  about the  effects  of SFAS 123 on  reported
income and will require disclosure of these affects in the interim  consolidated
financial  statements  as well.  SFAS 148 will be effective  for interim  fiscal
periods  beginning  after  December  15,  2002.  The Company  believes  that the
adoption  of this  standard  will have no  material  impact on its  consolidated
operating results and financial position.

     In January  2003,  the FASB issued FASB  Interpretation  No. 46 ("FIN 46"),
"Consolidation of Variable Interest Entities",  an Interpretation of ARB No. 51.
FIN 46 requires  certain  variable  interest  entities to be consolidated by the
primary  beneficiary of the entity if the equity  investors in the entity do not
have the  characteristics  of a  controlling  financial  interest or do not have
sufficient  equity at risk for the  entity to  finance  its  activities  without
additional  subordinated  financial  support  from  other  parties.  FIN  46  is
effective immediately for all new variable interest entities created or acquired
after January 31, 2003. For variable interest entities created or acquired prior
to  February  1, 2003,  the  provisions  of FIN 46 must be applied for the first
interim or annual period  beginning  after June 15, 2003.  The Company  believes
that  the  adoption  of this  standard  will  have  no  material  impact  on the
consolidated financial statements.


NOTE 2 - INVENTORIES

     Inventories  are stated at the lower of standard  cost (which  approximates
the first-in,  first-out basis) or market.  The components of inventories are as
follows:



                                                                          December 31,                June 30,
(in thousands)                                                                   2002                    2002
- --------------------------------------------------------------------------------------------------------------
                                                                                             

Inventories
     Customer service parts                                               $    116,039            $    116,240
     Raw materials                                                              44,293                  75,753
     Work-in-process                                                            60,790                  53,542
     Demonstration equipment                                                    40,998                  54,003
     Finished goods                                                             27,836                  23,478
- --------------------------------------------------------------------------------------------------------------
          Total                                                           $    289,956            $    323,016
==============================================================================================================


NOTE 3 - STOCK REPURCHASE PROGRAM

     The Company has adopted a plan to repurchase  shares of its Common Stock on
the open  market for the purpose of  partially  offsetting  dilution  created by
employee stock options and stock purchase  plans. On October 10, 2002, the Board
of Directors authorized the repurchase of an additional 5.0 million shares under
the plan.  During the six months ended  December 31, 2002 and 2001,  the Company
repurchased  1,466,000  and  3,130,000  shares of its Common  Stock at a cost of
approximately $48 million and $111 million.


NOTE 4  - COMPREHENSIVE INCOME

The components of comprehensive income, net of tax, are as follows:


                                                                     Three months ended           Six months ended
                                                                      December 31,                    December 31,
(in thousands)                                                        2002           2001        2002         2001
                                                                                             

- -------------------------------------------------------------------------------------------------------------------
Net income                                                       $  29,228   $   49,048     $  80,493    $ 135,513
- -------------------------------------------------------------------------------------------------------------------
Other comprehensive income (loss):
 Currency translation adjustments                                    3,966       (6,586)        1,600       (2,659)
 Gain (loss) on cash flow hedging instruments, net                  (1,356)       3,977         1,469        1,235
 Unrealized gains (losses) on investments, net of taxes
  (benefits) of $ (2,097) and $ 343 for the three and six months
  ended December 31, 2002 and $80 and $281 for the three and
  six month months ended December 31, 2001                          (3,321)        (126)          544         (445)
- -------------------------------------------------------------------------------------------------------------------
       Other comprehensive income (loss)                              (711)      (2,735)        3,613       (1,869)
- -------------------------------------------------------------------------------------------------------------------
       Total Comprehensive Income                                $  28,517   $   46,313     $  84,106    $ 133,644
===================================================================================================================



NOTE 5 - NONRECURRING ACQUISITION, RESTRUCTURING AND OTHER COSTS

Restructuring and Other Costs

     During the three months ended September 30, 2002,  KLA-Tencor  restructured
certain of its operations and facilities to accommodate the planned occupancy of
its Livermore campus and to streamline  operations due to the industry downturn.
Restructuring  costs were  classified into two main  categories:  facilities and
other charges of $4.6 million and  severance  and benefits of $1.1  million.  As
part of the  facilities  consolidation,  KLA-Tencor  is  exiting  several of its
leased  buildings  and have included the remaining net book value of the related
leasehold  improvements as well as the future lease payments, net of anticipated
sublease  revenue,  in the charge.  Severance and benefits  include  involuntary
termination  of  approximately  70 personnel  from  manufacturing,  engineering,
sales, marketing, and administration in the United States, Japan and Europe. The
following  table  shows  the  details  of the  facilities,  severance  and other
restructuring costs accrual for the six months ended December 31, 2002:



                                 Balance at      Non-recurring                             Balance at
(in thousands)                 June 30, 2002           charges          Utilized      December 31, 2002
- --------------------------------------------------------------------------------------------------------
                                                                                 
Facilities and other                $    405         $   4,623         $   (801)             $     4,227
Severance and benefits                    --             1,127             (862)                     265
- --------------------------------------------------------------------------------------------------------
   Total                            $    405         $   5,750         $ (1,663)             $     4,492
========================================================================================================


     In addition,  during the first fiscal quarter of 2003,  KLA-Tencor received
$15.2 million as a second  installment on the sale of software and  intellectual
property  associated with its iSupport(TM)  on-line customer support technology,
which  was  netted  against  the above  non-recurring  charges,  resulting  in a
reported net gain of $9.4 million.

NOTE 6 - COMMITMENTS AND CONTINGENCIES

Facilities

     KLA-Tencor leases certain of its facilities under operating  leases,  which
qualify for operating lease accounting  treatment under SFAS 13, "Accounting for
Leases,"  and, as such,  these  facilities  are not  included  on its  Condensed
Consolidated Balance Sheet.

     The following is a schedule of operating leases payments as of December 31,
2002 (in thousands):

         Fiscal year ended June 30,                              Amount
         --------------------------------------------------------------
         2003                                                 $   5,630
         2004                                                     7,127
         2005                                                     4,469
         2006                                                     2,459
         Thereafter                                               7,210
         --------------------------------------------------------------

         Total minimum lease payments                         $  26,895
         ==============================================================

     The  lease  agreement  for  certain  Milpitas  and  San  Jose,   California
facilities had a term of five years ending in November  2002,  with an option to
extend up to two more years.  Under the terms of the lease,  KLA-Tencor,  at its
option,  could acquire the  properties at their original cost or arrange for the
properties  to be  acquired.  In  November  2002,  the Company  purchased  these
facilities at the end of the lease term. The purchase transaction increased land
and  property  by  approximately  $120  million and  decreased  cash by the same
amount.

Factoring

     KLA-Tencor  has  agreements  with two  banks to sell  certain  of its trade
receivables and promissory notes without  recourse.  During the three months and
six months ended December 31, 2002,  approximately  $26 million and $48 million,
respectively,  of receivables were sold under these arrangements. As of December
31, 2002, approximately $34 million of receivables sold under these arrangements
were outstanding.  The total amount available under the facility is the Japanese
yen equivalent of $92 million based upon exchange rates as of December 31, 2002.
KLA-Tencor  does not believe it is materially at risk for any losses as a result
of this agreement.

Purchase Commitments

     KLA-Tencor  maintains certain open inventory purchase  commitments with its
suppliers to ensure a smooth and  continuous  supply  chain for key  components.
KLA-Tencor's  liability in these purchase commitments is generally restricted to
a forecasted  time-horizon  as mutually  agreed upon  between the parties.  This
forecast  time-horizon  can vary amongst  different  suppliers.  As such,  it is
difficult to precisely  report its true open commitments at any particular point
in time.  However,  the Company estimates its open inventory purchase commitment
as of December 31, 2002 to be no more than $49 million.

Derivative Instruments

     KLA-Tencor's foreign subsidiaries operate and sell KLA-Tencor's products in
various global markets. As a result, KLA-Tencor is exposed to changes in foreign
currency exchange rates.  KLA-Tencor  utilizes foreign currency forward exchange
contracts to hedge against  certain future  movements in foreign  exchange rates
that  affect   certain   foreign   currency   denominated   sales  and  purchase
transactions.  KLA-Tencor  does not use  derivative  financial  instruments  for
speculative or trading  purposes.  At December 31, 2002,  KLA-Tencor had foreign
exchange forward contracts maturing  throughout fiscal 2003 to sell and purchase
$172  million and $55  million,  respectively,  in foreign  currency,  primarily
Japanese yen.

Legal Matters

     A discussion  regarding  certain  pending legal  proceedings is included in
Part I, Item 3, "Legal Proceedings,"  included in our Annual Report on Form 10-K
for the fiscal  year ended June 30,  2002.  Since the fiscal year ended June 30,
2002,  certain  developments have occurred with respect to the legal proceedings
described in our Annual Report as follows:

     ADE Corporation

     On October 11, 2000, ADE Corporation ("ADE"), a competitor,  filed a patent
infringement  lawsuit against KLA-Tencor in the U.S. District Court in Delaware.
ADE claimed  damages and sought an injunction  under U.S.  Patent No.  6,118,525
(`525 patent).  We filed a counterclaim  in the same court alleging that ADE has
infringed four of our patents. We are seeking damages and a permanent injunction
against ADE. In addition,  we are seeking a declaration  from the District Court
that ADE's  patent is invalid and not  infringed by  KLA-Tencor.  On October 22,
2001, we filed a separate  action for  declaratory  judgment  against ADE in the
Northern  District of California  requesting a declaration  that U.S. Patent No.
6,292,259  (`259 patent) is invalid and not infringed.  That action has now been
consolidated  with the prior  action  in the  Delaware  proceeding,  and ADE has
amended its complaint in that proceeding to allege that KLA-Tencor is infringing
the `259 patent.  On August 8, 2002,  the  magistrate  presiding over the action
issued a  recommendation  that the  court  enter  summary  judgment  in favor of
KLA-Tencor on the issue of non-infringement under ADE's `525 patent. On the same
day, the magistrate issued recommendations that the court enter summary judgment
in favor of ADE on the issue of non-infringement of two of KLA-Tencor's patents.

     Tokyo Seimitsu Co. Ltd.

     On June 27,  2001,  we sued Tokyo  Seimitsu  Co. Ltd.  and TSK America Inc.
("TSK"),  a competitor,  in the U.S.  District Court in the Northern District of
California alleging that TSK infringes on one of the Company's patents. The suit
seeks damages and an injunction  under U.S. Patent No.  4,805,123 (`123 patent).
TSK filed a counterclaim  in the same court seeking a declaration  that the `123
patent is invalid,  unenforceable and not infringed, and also alleged violations
of the antitrust and unfair competition laws.

     Schlumberger, Inc. and Rigg Systems, Inc.

     The Schlumberger,  Inc. and Rigg Systems,  Inc. actions have been dismissed
under circumstances that the parties have agreed to treat as confidential.

NOTE 7 - GOODWILL AND OTHER INTANGIBLE ASSETS

     Effective  July  1,  2001,   KLA-Tencor   adopted  Statement  of  Financial
Accounting  Standards No. 141,  "Business  Combinations," and No. 142, "Goodwill
and Other  Intangible  Assets."  Under these  accounting  standards,  KLA-Tencor
ceased amortization of goodwill recorded for business  combinations  consummated
prior to July 1, 2001,  and  reclassified  amounts  attributed  to  workforce in
acquisitions  made  prior to July 1,  2001  that did not meet the  criteria  for
separate recognition as other intangible assets under SFAS 141 to goodwill.

     The net carrying value of goodwill  recorded through  acquisitions is $16.2
million  as of  December  31,  2002.  In  accordance  with SFAS 142,  KLA-Tencor
concluded  there was no impairment of goodwill.  The net carrying value of other
intangible  assets as of December 31, 2002 is $7.0  million;  the  components of
which are as follows (in thousands):



                                    Gross Carrying            Accumulated               Net
                                            Amount           Amortization            Amount
- --------------------------------------------------------------------------------------------
                                                                        
Existing technology                   $     6,062             $     3,063        $    2,999
Patents                                     4,761                   1,231             3,530
Trademark                                     625                     230               395
Favorable leases and other                    270                     149               121
- --------------------------------------------------------------------------------------------
 Subtotal                             $    11,718             $     4,673         $   7,045
============================================================================================



     Other intangible  assets are amortized on a straight-line  basis over their
estimated  useful lives.  For the three months ended December 31, 2002 and 2001,
amortization  expense  for other  intangible  assets was $0.6  million  and $0.6
million,  respectively.  For the six months  ended  December  31, 2002 and 2001,
amortization  expense  for other  intangible  assets was $1.2  million  and $0.9
million,  respectively.  Estimated  amortization  expense  for  each of the five
succeeding fiscal years is as follows:

Fiscal year ended June 30:.............................          Amount
         2003                                                 $   2,454
         2004                                                     2,454
         2005                                                     2,195
         2006                                                       689
         Thereafter                                                 488


NOTE 8 - GEOGRAPHIC INFORMATION

     KLA-Tencor is engaged primarily in designing,  manufacturing, and marketing
yield  management and process  control systems for the  semiconductor  industry.
KLA-Tencor conducts business globally and has significant operations outside the
United  States,  which  include a  manufacturing  facility  in Israel and sales,
marketing and service  offices in Europe,  Japan,  and the Asia Pacific  region.
Geographical  revenue  is  attributed  to the  geographic  regions  in which the
customer is located.  The  following is a summary of operations by the indicated
geographic  regions for the three months and six months ended  December 31, 2002
and 2001.



                                                           Three months ended                 Six months ended
                                                            December 31, 2002                December 31, 2002
 (in thousands)                                           2002           2001              2002            2001
- ---------------------------------------------------------------------------------------------------------------
                                                                                       

Revenue:
     United States                                $     91,959   $    101,369      $    182,057    $    237,661
     Europe                                             40,545         64,260           112,731         145,034
     Japan                                              65,848         93,828           157,878         209,179
     Taiwan                                             85,537         82,591           150,690         149,797
     Asia Pacific                                       51,029         62,100           107,082         165,309
- ---------------------------------------------------------------------------------------------------------------
         Total                                    $    334,918   $    404,148      $    710,438    $    906,980
===============================================================================================================


     Long-lived  assets  consist  of  net  property  and  equipment,   goodwill,
capitalized  software  and  other  intangibles,   and  other  long-term  assets,
excluding  long-term  deferred tax assets and are  attributed to the  geographic
region in which they are physically located:


                                                                         December 31,         June 30,
 (in thousands)                                                                 2002             2002
- -----------------------------------------------------------------------------------------------------
                                                                                   
Long-lived assets:
    United States                                                      $     478,378     $    375,600
    Europe                                                                     7,745            8,079
    Japan                                                                      7,408            8,878
    Taiwan                                                                     3,179            3,732
    Asia Pacific                                                               5,052            5,435
- -----------------------------------------------------------------------------------------------------
         Total                                                         $     501,762     $    401,724
=====================================================================================================


     The  following  is a summary  of revenue  by major  products  for the three
months and six months ended December 31, 2002 and 2001 (as a percentage of total
revenue).



                                                           Three months ended                 Six months ended
                                                            December 31, 2002                December 31, 2002
                                                          2002           2001              2002            2001
- ---------------------------------------------------------------------------------------------------------------
                                                                                                

Revenue:
     Defect Inspection                                     56%            67%               61%             67%
     Metrology                                             16%            15%               16%             16%
     Service                                               20%            12%               18%             11%
     Software and other                                     8%             6%                5%              6%
- ---------------------------------------------------------------------------------------------------------------
     Total                                                100%           100%              100%            100%
===============================================================================================================


     In the three and six months  ended  December  31, 2002 and 2001,  no single
customer accounted for more than 10 percent of revenue.

NOTE 9 - SUBSEQUENT EVENTS

     On January 28,  2002,  a second  installment  of 2.9 million  options  (2.7
million to non-executive  employees and 0.2 million to executive  employees) was
granted,  as part of the fiscal year 2002  annual  performance  cycle  review of
KLA-Tencor.







ITEM 2.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
           RESULTS OF OPERATIONS


FORWARD-LOOKING STATEMENTS

     This report contains certain forward-looking  statements within the meaning
of Section 27A of the  Securities  Act of 1933 and Section 21E of the Securities
Exchange Act of 1934. All statements included in or incorporated by reference in
this Quarterly  Report on Form 10-Q,  other than statements of historical  fact,
are forward-looking  statements.  Such forward-looking statements include, among
others,  those  statements  regarding the future results of our operations;  the
allocation of capital  spending by our  customers;  technological  trends in the
semiconductor  industry;  our future product offerings and product features,  as
well as market  acceptance  of new  products;  the growth in demand for  process
controls;  anticipated revenue from various domestic and international  regions;
international  sales and operations;  maintenance of our competitive  advantage;
success  of our  product  offerings;  creation  of  programs  for  research  and
development; attraction and retention of employees; management of risks involved
in acquisitions of third parties, or the technology or assets thereof;  benefits
received from any  acquisitions  and development of acquired  technologies;  the
outcome of any litigation to which we are a party;  results of our investment in
leading edge  technologies;  our future income tax rate;  the effects of hedging
transactions;  sufficiency  of our existing cash balance,  investments  and cash
generated   from   operations  to  meet  our   operating  and  working   capital
requirements; and the adoption of new accounting pronouncements.

     Our actual  results may differ  significantly  from those  projected in the
forward-looking   statements  in  this  report.  Factors  that  might  cause  or
contribute to such differences  include, but are not limited to, those discussed
in this  section  and those set forth in Item 7,  "Management's  Discussion  and
Analysis  of  Financial  Condition  and  Results  of  Operations"  and  Item  1,
"Business" in the Company's Annual Report on Form 10-K for the fiscal year ended
June 30, 2002,  filed with the  Securities  and Exchange  Commission  ("SEC") on
September 20, 2002. You should  carefully review these risks and also review the
risks  described in other  documents we file from time to time with the SEC. You
are cautioned not to place undue reliance on these  forward-looking  statements.
We expressly  disclaim  any  obligation  to update or alter our  forward-looking
statements, whether, as a result of new information, future events or otherwise.


CRITICAL ACCOUNTING POLICIES

     The  preparation  of our  Condensed  Consolidated  Financial  Statements in
conformity with accounting principles generally accepted in the United States of
America  requires  management to make estimates and assumptions  that affect the
reported  amounts of assets,  liabilities,  revenue  and  expenses,  and related
disclosure of contingent  assets and  liabilities.  We based these estimates and
assumptions on historical experience,  and evaluate them on an on-going basis to
ensure they remain  reasonable  under current  conditions.  Actual results could
differ from those  estimates.  We discuss the  development  and selection of the
critical accounting estimates with the audit committee of our board of directors
on a  quarterly  basis,  and the audit  committee  has  reviewed  the  Company's
critical accounting  estimates as described in Item 7, "Management's  Discussion
and Analysis of Financial  Condition and Results of Operations" in the Company's
Annual  Report on Form 10-K for the fiscal year ended June 30, 2002,  filed with
the SEC on September 20, 2002.  For the six months ended December 31, 2002 there
have been no changes to these critical accounting policies.


RESULTS OF OPERATIONS

     KLA-Tencor  Corporation is the world's leading  supplier of process control
and   yield   management   solutions   for   the   semiconductor   and   related
microelectronics  industries. Our comprehensive portfolio of products, software,
analysis,  services  and  expertise  is  designed  to  help  integrated  circuit
manufacturers  manage yield  throughout the entire wafer  fabrication  process -
from research and development to final mass production yield analysis.

     We continue to face a significant  downturn in the semiconductor  industry,
which started in early calendar year 2001. Although new orders grew sequentially
by more than $40 million in the three months ended  December 31, 2002,  compared
to the previous quarter,  we still have very limited visibility as to the timing
of a broad based turnaround in the growth of demand for semiconductors.

     Over the longer term, we expect process  control to continue to represent a
higher percentage of our customers'  capital spending.  We believe this increase
in  process  control  spending  will be driven by the  demand  for more  precise
diagnostics  capabilities  as a result of further  shrinking  of device  feature
sizes, the transition to copper and other new materials, and the move toward 300
millimeter  wafers.  We anticipate these factors will drive increased demand for
our products and services when the semiconductor industry recovers.

New orders by region were as follows (in millions):



                                                     Three months ended                 Three months ended
                                                      December 31, 2002                 September 30, 2002
- ----------------------------------------------------------------------------------------------------------
                                                                                           
United States                                                 $      92                          $      80
Europe                                                               58                                 30
Japan                                                                67                                 57
Taiwan                                                               17                                 46
Asia Pacific                                                         52                                 29
- ----------------------------------------------------------------------------------------------------------
     Total orders                                             $     286                          $     242
==========================================================================================================


KLA-Tencor's backlog for unshipped orders as of December 31, 2002 was
approximately $463 million.

Revenue and Gross Margin

     Product  revenue  decreased  $87  million,  or 24%, to $268 million for the
three  months  ended  December  31, 2002 from $355  million for the three months
ended December 31, 2001. Product revenue declined $228 million,  or 28%, to $581
million for the six months ended December 31, 2002 from $809 million for the six
months  ended  December  31,  2001.  Our  decline  in product  revenue  resulted
primarily  from  reduced  capital  spending  by our  customers  as a result of a
significant  reduction in the demand for semiconductors over the last two years.
International  revenue  decreased  to 73% of revenue,  in the three months ended
December 31, 2002 from 75% in the same period of the prior  fiscal year,  due to
lower revenue in Japan and Europe  partially offset by higher revenue in Taiwan.
International  revenue remained relatively constant at 74% of revenue,  for each
of the six months ended  December 31, 2002 and 2001. In the three and six months
ended December 31, 2002 and 2001, no single customer accounted for more than 10%
of our revenue.

     Service revenue is generated from maintenance service contracts, as well as
time and  material  billable  service  calls  made to our  customers  after  the
expiration  of the  warranty  period.  Service  revenue were $67 million and $50
million for the three  months ended  December  31, 2002 and 2001,  respectively.
Service  revenue  were $130  million and $98  million  for the six months  ended
December 31, 2002 and 2001, respectively.  Service revenue continued to increase
throughout  fiscal  year  2002 and the first  six  months of fiscal  2003 as our
installed base of equipment at customer  sites  continued to grow. The amount of
service   revenue   generated  is  generally   proportional  to  the  number  of
post-warranty  systems installed at customer sites and the degree of utilization
of those systems. We expect service revenue to remain flat to slightly higher in
the next few quarters.

     Gross margins as a percentage of revenue were 49% and 50% for the three and
six months ended December 31, 2002, compared to 50% and 51% for the same periods
in the prior fiscal year.  Gross margin declined year over year primarily due to
our reduced capacity  utilization  resulting from lower production volume and an
increased  percentage  of sales in the  service  business,  partially  offset by
favorable  warranty costs experienced by our latest generation  products as they
continue to mature.  In the near term, we expect our gross margin  percentage to
remain relatively flat.

Engineering, Research and Development

     Net engineering, research and development ("R&D") expenses were $72 million
and $143 million for the three and six months ended December 31, 2002,  compared
to $74 million and $147  million for the same  periods in the prior fiscal year.
As a percentage of revenue,  R&D expenses were 22% and 20% for the three and six
months ended December 31, 2002,  compared to 18% and 16% for the same periods in
the prior  fiscal  year.  The  absolute  dollars  for R&D  investment  decreased
primarily   due  to  company   mandated   time-off,   reductions  in  labor  and
discretionary  spending as well as other cost saving measures  implemented  over
the last several quarters in response to the industry slow down.

     Gross engineering,  research and development expenses were partially offset
by external  funding  received  under  certain  strategic  development  programs
conducted  with several of our  customers  and  government  grants.  We received
external  funding of $4  million  and $10  million  for the three and six months
ended December 31, 2002,  respectively compared to $3 million and $6 million for
the three and six months ended December 31, 2001, respectively.

     Our future  operating  results will depend  significantly on our ability to
produce products and provide  services that have a competitive  advantage in our
marketplace.  To do this, we believe that we must  continue to make  substantial
investments  in our research and  development  efforts.  We remain  committed to
product  development in new and emerging  technologies as we address the further
shrinking  of device  feature  sizes,  the  transition  to copper  and other new
materials,  and the move toward  300-millimeter  wafers.  Our investments in new
technology  and  existing  product  enhancements  are  intended  to  enable  our
customers to achieve a higher  return on their  capital  investments  and higher
productivity through cost-effective, leading edge technology solutions.

Selling, General and Administrative

     Selling,  general  and  administrative  expenses  were $65 million and $136
million for the three and six months ended  December  31, 2002,  compared to $72
million and $153 million for the same  periods in the prior  fiscal  year.  As a
percentage of revenue, selling, general and administrative expenses were 19% for
the three and six months ended  December  31, 2002,  compared to 18% and 17% for
the same  periods in the prior fiscal  year.  The absolute  dollars for selling,
general and administrative  expenses decreased primarily due to company mandated
time-off,  reductions in labor and discretionary  spending as well as other cost
saving measures  implemented  over the last several  quarters in response to the
industry  slowdown  and the  ongoing  global  economic  weakness.  We expect our
selling, general and administrative expenses to continue to decrease in absolute
dollars as we continue to realize the benefits from these cost saving measures.

Restructuring and Other Costs

     During the three months ended September 30, 2002, we  restructured  certain
of our operations and  facilities to  accommodate  the planned  occupancy of our
Livermore  campus  and as to  streamline  our  operations  due  to the  industry
downturn.   Restructuring  costs  were  classified  into  two  main  categories:
facilities  and other charges of $4.6 million and severance and benefits of $1.1
million. As part of our facilities consolidation,  we are exiting several of our
leased  buildings  and have included the remaining net book value of the related
leasehold  improvements as well as the future lease payments, net of anticipated
sublease  revenue,  in the  charge.  If  facilities  rental  rates  continue  to
deteriorate  or if it takes longer than expected to sublease  these  facilities,
the actual loss could  increase.  Severance  and  benefits  include  involuntary
termination  of  approximately  70 personnel  from  manufacturing,  engineering,
sales, marketing, and administration in the United States, Japan and Europe. The
following  table  shows  the  details  of the  facilities,  severance  and other
restructuring costs accrual as of December 31, 2002:


                                 Balance at      Non-recurring                             Balance at
(in thousands)                 June 30, 2002           charges          Utilized      December 31, 2002
- --------------------------------------------------------------------------------------------------------
                                                                                 
Facilities and other                $    405         $   4,623         $   (801)             $     4,227
Severance and benefits                    --             1,127             (862)                     265
- --------------------------------------------------------------------------------------------------------
   Total                            $    405         $   5,750         $ (1,663)             $     4,492
- --------------------------------------------------------------------------------------------------------


     In addition,  during the first fiscal  quarter of 2003,  we received  $15.2
million  as a  second  installment  on the  sale of  software  and  intellectual
property  associated with our iSupport(TM)  on-line customer support technology,
which we netted  against the above  non-recurring  charges,  resulting  in a net
reported gain of $9.4 million.

Interest Income and Other, Net

     Interest  income and other,  net,  was $12  million and $22 million for the
three and six months ended  December  31, 2002,  compared to $10 million and $23
million in the same periods in the prior fiscal year. Interest income and other,
net is comprised primarily of gains realized on sales of marketable  securities,
interest income earned on our investment and cash  portfolio,  as well as income
recognized upon settlement of certain foreign currency  contracts and unrealized
gains and  losses  from  marking  to market  investments  classified  as trading
securities.

Provision for Income Taxes

     Our effective  tax rate for the three months and six months ended  December
31, 2002 was 24%.  This was lower than the effective tax rate of 26% realized in
the same  periods  of the  prior  fiscal  year.  The  overall  reduction  in our
effective tax rate was  primarily the result of more R&D credits and  tax-exempt
interest  compared  relatively  to these same items as a  percentage  of pre-tax
income of the same  periods  during the prior fiscal  year.  There  currently is
pending  legislation to repeal export  incentives  provided by the United States
Tax Code. If the  legislation  were approved it would increase our effective tax
rate in future periods.

Stock Option and Incentive Plans

     KLA-Tencor's  stock option  program is a broad-based,  long-term  retention
program  that is  intended  to  attract  and  retain  qualified  management  and
technical employees ("knowledge employees"),  and align stockholder and employee
interests. Under KLA-Tencor's stock option plans, options generally have vesting
periods of four or five years,  are  exercisable  for a period not to exceed ten
years from the date of issuance and are granted at prices not less than the fair
market  value of  KLA-Tencor's  common  stock at the grant  date.  This  program
consists of three plans: one under which  non-employee  directors may be granted
options  to  purchase  shares  of our  stock,  another  in which  officers,  key
employees,  consultants  and all other  employees may be granted options and one
other in which  consultants  and all employees other than directors and officers
may be granted options to purchase shares of our stock. Substantially all of our
employees that meet established performance goals and that qualify as "knowledge
employees"  participate  in one of our stock option  plans.  Options  granted to
employees  from fiscal year 2000 through the six months ended  December 31, 2002
are summarized as follows (in thousands):



                                                     Six months ended
                                                          December 31                 Fiscal years ended June 30,
                                                              2002             2002                2001              2000
                                                     ----------------   ---------------   ---------------   ---------------
                                                                                                      
Weighted average number of shares outstanding              189,018          187,677             185,860           182,177


Total options granted during the period                      1,912            9,760              10,274             8,166
Less options forfeited                                      (1,013)          (1,786)             (2,418)           (1,484)
                                                     ----------------   ---------------   ---------------   ---------------
Net options granted                                            899            7,974               7,856             6,682
Net grants during the period as a percentage of
total shares outstanding                                      0.5%             4.2%                4.2%              3.6%

Grants to top five officers during the period as a
percentage of total shares outstanding                       0.05%             0.3%                0.2%              0.2%

Grants to top five officers during the period as a
percentage of total options granted                           5.0%             6.0%                4.0%              5.0%


     During the six months ended December 31, 2002, the Company  granted options
to purchase  approximately  1.9 million  shares of stock to  employees.  The net
options granted after forfeiture represented 0.5% of total outstanding shares of
approximately 189.0 million as of December 31, 2002.

     During the six months ended  December 31, 2002,  there were 89,000  options
granted to the top five officers,  who represent the chief executive officer and
each of the four other most highly  compensated  executive officers whose salary
plus bonus exceeded  $100,000 for the fiscal year ended June 30, 2002. All stock
option  grants to officers  are made with a review by, and with the  approval of
the  Compensation  Committee  of the  Board of  Directors.  All  members  of the
Compensation Committee are independent  directors,  as defined in the applicable
rules for issuers traded on the NASDAQ Stock Market.

     The following  table  summarizes  stock  options  exercised by the top five
officers during the six months ended December 31, 2002:


                                                          Total Number of
                                                          Securities Underlying    Total Value of
                                                          Unexercised Options at   Unexercised,
                                                          December 31, 2002        In-the-Money Options at
                                                                                   December 31, 2002  (1)

                                                          --------------------------------------------------------
                               Shares
                               Acquired on  Value
                               Exercise     Realized      Vested        Unvested   Exercisable     Unexercisable
- ------------------------------------------------------------------------------------------------------------------
                                                                                 
Kenneth Levy                   0            0             907,130       84,961     $20,439,031     $426,622
Chairman of the Board

Kenneth L. Schroeder           0            0             833,774       450,356    $15,838,515     $3,016,962
Chief Executive Officer

Gary E. Dickerson              0            0             234,175       188,190    $2,054,688      $1,041,505
President & Chief Operating
Officer

John Kispert                   0            0             75,625        105,075    $489,459        $587,828
Executive Vice President and
Chief Financial Officer

Dennis Fortino                 0            0             100,384       105,033    $444,488        $541,694
Executive Vice President


(1) Total value of vested options based on fair market value of Company's Common
Stock of $37.36 per share as of December 31, 2002.

     The  following  table  summarizes  KLA-Tencor's  stock  option  plans as of
December 31, 2002:


                                                                                        Number of securities
                                                                                         remaining available
                            Number of securities to         Weighted-average             for future issuance
                            be issued upon exercise           exercise price of                  under stock
                             of outstanding options       outstanding options                    option plan
                           ------------------------       -------------------   ----------------------------
                                                                                                
Stock option
plan approved by
stockholders (3)                         23,304,780       $             27.43                     13,172,266

Stock option plan
not approved by
stockholders(1)(2)                        6,797,505                     35.70                      6,240,898 (1)
                           ------------------------       -------------------       ------------------------
Total                                    30,102,285       $             29.19                     19,413,164
                           ========================       ===================       ========================
   =


(1) In August 2002, the Board of Directors authorized an increase in the number
    of securities reserved for additional future issuance under the Company's
    stock option plans (other than the Company's Director Stock Option Plan) of
    an aggregate of 7,589,102 shares.
(2) Officers and directors are not eligible to receive options granted under
    this plan.
(3) In August 2002, the Company reserved an additional 5,691,826 shares of its
    common stock in accordance with the provisions of the 1982 Stock Option
    plan.

     On November 8, 2002, the  Compensation  Committee of the Board of Directors
authorized  approximately  5.5  million  options as part of the fiscal year 2002
annual  performance  review cycle for KLA-Tencor.  There were  approximately 5.0
million  options  authorized  to  non-executive  employees  under the 2000 Stock
Option Plan, and 0.5 million options authorized to executive employees under the
1982 Stock  Option  Plan.  KLA-Tencor  intends to grant these  options  over the
course of the fiscal year ending June 30,  2003.  The first  installment  of 1.4
million  options  (1.3  million to  non-executive  employees  and 0.1 million to
executive employees) was granted on November 8, 2002. Additionally,  60 thousand
options  were  granted on November 8, 2002 to outside  directors  under the 1998
Outside Director Option Plan. The summary activity under the stock option plans,
was as follows:


                                                                                                 Weighted-
                                                       Available                Options            Average
                                                       For Grant            Outstanding              Price
- ----------------------------------------------------------------------------------------------------------
                                                                                        
Balances at June 30, 2000                              5,146,702             22,355,712          $   20.23
     Additional shares reserved                       11,216,391                    ---                ---
     Options granted                                 (10,273,504)            10,273,504              37.09
     Options canceled/expired                          2,418,485             (2,418,485)             36.15
     Options exercised                                       ---             (3,921,145)             14.71
- ------------------------------------------------------------------------------------------------------------
Balances at June 30, 2001                              8,508,074             26,289,586          $   26.18
     Additional shares reserved                        5,610,752                    ---                ---
     Options granted                                  (9,760,303)             9,760,303              31.83
     Options canceled/expired                          1,786,295             (1,786,295)             32.55
     Options exercised                                       ---             (4,173,887)             19.36
- ------------------------------------------------------------------------------------------------------------
Balances at June 30, 2002                              6,144,818             30,089,707          $   28.60
     Additional shares reserved                       13,280,928                    ---                ---
     Options granted                                  (1,911,216)             1,911,216              35.81
     Options canceled/expired                          1,012,374             (1,012,374)             35.00
      Options exercised                                      ---               (886,264)             18.03
- ----------------------------------------------------------------------------------------------------------
Balances at December 31, 2002                         18,526,900             30,102,285          $   29.19
- ----------------------------------------------------------------------------------------------------------



LIQUIDITY AND CAPITAL RESOURCES

     Cash, cash equivalents and short-term investments balances during the three
months ended  December  31, 2002  increased to $806 million from $673 million at
June 30, 2002.  In addition  marketable  securities  classified  as long-term at
December 31, 2002  decreased to $504 million from $660 million at June 30, 2002.
KLA-Tencor has historically  financed its operations through cash generated from
operations.  Net cash provided by operating  activities for the six months ended
December  31,  2002 was $98  million,  compared  to $55 million of net cash from
operating activities for the same period of the prior fiscal year. This increase
primarily  resulted from a lower accounts  receivable and  inventories  balance,
partially offset by a decrease in deferred profit.  Accounts receivable declined
primarily  due to  strong  collections,  as well  as  lower  product  shipments.
Inventories  declined  due to  aggressive  monitoring  and control of  inventory
purchases  and lower  manufacturing  activity.  Net cash  provided by  investing
activities for the six months ended December 31, 2002 was $16 million,  compared
to $202 million used in  investing  activities  for the same period of the prior
fiscal  year,  primarily  from  increased  net  sales of  marketable  securities
partially  offset by our purchase of certain of the leased buildings in November
2002.

     Net cash used in financing activities for the six months ended December 31,
2002 was $15 million as compared to $77 million for the same period of the prior
fiscal year.  This decline was primarily due to decreases in stock  repurchases.
We paid $48  million  for the  repurchase  of our common  stock  under our stock
repurchase  program  during the six months ended  December 31, 2002  compared to
$111 million for the same period of the prior year.

     The  lease  agreement  for  certain  Milpitas  and  San  Jose,   California
facilities had a term of five years ending in November  2002,  with an option to
extend up to two more  years.  Under the terms of the lease,  we, at our option,
could  acquire  the  properties  at  their  original  cost  or  arrange  for the
properties to be acquired.  In November 2002, we purchased  these  facilities at
the end of the lease term. The purchase transaction  increased land and property
by approximately $120 million and decreased cash by the same amount.

     The following is a schedule  summarizing our significant  commitments as of
December 31, 2002 (in millions):
                                             Payments Due by Period
                 ---------------------------------------------------------------
                  Total      1 year       2-3 years      3-4 years  Over 5 years
                 ---------------------------------------------------------------
Operating leases $  26.9     $   5.6        $    7.1      $    4.5        $  9.7
                 ---------------------------------------------------------------


     We have agreements with two banks to sell certain of our trade  receivables
and  promissory  notes without  recourse.  During the three and six months ended
December 31,  2002,  approximately  $26 million and $48 million of  receivables,
respectively,  were sold under  these  arrangements.  As of December  31,  2002,
approximately  $34 million of  receivables  sold under these  arrangements  were
outstanding.  The total amount  available under the facility is the Japanese yen
equivalent of $92 million based upon exchange  rates as of December 31, 2002. We
do not  believe  we are  materially  at risk for any  losses as a result of this
agreement.


     Additionally,  we maintain certain open inventory purchase commitments with
our suppliers to ensure a smooth and continuous supply chain for key components.
Our  liability  in these  purchase  commitments  is  generally  restricted  to a
forecasted  time-horizon  as mutually  agreed upon  between  the  parties.  This
forecast  time-horizon  can vary amongst  different  suppliers.  As such,  it is
difficult to precisely  report our true open commitments at any particular point
in time.  However,  we estimate our open  inventory  purchase  commitments as of
December 31, 2002 to be no more than $49 million.

     Working  capital  increased  to $1.06  billion  as of  December  31,  2002,
compared to $932  million at June 30,  2002.  We believe  that  existing  liquid
capital resources and funds generated from operations combined with the ability,
if necessary, to borrow funds will be adequate to meet our business requirements
for the  foreseeable  future,  including  potential  acquisitions  or  strategic
investments,   capital   expenditures   for  the   expansion   or  upgrading  of
manufacturing capacity and working capital requirements. However, we can give no
assurances that we will continue to generate sufficient funds from operations or
that we will be able to  borrow  funds on  reasonable  terms in the  future,  if
necessary.


FACTORS AFFECTING RESULTS, INCLUDING RISKS AND UNCERTAINTIES

Fluctuations in Operating Results and Stock Price

     Our  operating  results  have  varied  widely in the past,  and our  future
operating results will continue to be subject to quarterly variations based upon
a wide variety of factors,  including those listed in this section and those set
forth in Item 7,  "Management's  Discussion and Analysis of Financial  Condition
and Results of Operations" and Item 1, "Business" in the Company's Annual Report
on Form 10-K for the  fiscal  year ended  June 30,  2002,  filed with the SEC on
September 20, 2002.  In addition,  future  operating  results may not follow any
past trends.  We believe the factors that could make our results  fluctuate  and
difficult to predict  include:  o global  economic  uncertainty;  o the cyclical
nature  of  the  semiconductor   industry;  o  changing  international  economic
conditions;  o competitive  pressure; o our ability to develop and implement new
technologies  and  introduction  of new  products;  o our  ability to manage our
manufacturing requirements; o intellectual property protection; o our ability to
attract,   retain,  and  replace  key  employees;   and  o  worldwide  political
instability.

     Operating  results  also could be  affected  by sudden  changes in customer
requirements,  currency exchange rate fluctuations and other economic conditions
affecting  customer  demand  and the  cost of  operations  in one or more of the
global  markets in which we do business.  As a result of these or other factors,
we could fail to achieve our expectations as to future revenue, gross profit and
income from operations. Our failure to meet the performance expectations set and
published by external  sources could result in a sudden and significant  drop in
the price of our stock, particularly on a short-term basis, and could negatively
affect the value of any investment in our stock.

Global Economic Uncertainty

     Our  business  is  ultimately  driven by the global  demand for  electronic
devices by consumers and businesses. This end-user demand has been significantly
depressed over the last few quarters, and there has been very limited visibility
as to the timing of  turnaround  in demand  growth,  and from which  sector this
growth  will come.  A  protracted  global  economic  slowdown  will  continue to
exacerbate  this issue and may  adversely  affect our  business  and  results of
operation.

Semiconductor Equipment Industry Volatility

     The  semiconductor  equipment  industry is highly cyclical.  The purchasing
decisions of our  customers  are highly  dependent on the  economies of both the
local  markets  in  which  they  are  located  and  the  semiconductor  industry
worldwide.  The timing,  length and  severity of the  up-and-down  cycles in the
semiconductor  equipment industry are difficult to predict. This cyclical nature
of the industry in which we operate  affects our ability to  accurately  predict
future revenue and,  thus,  future expense  levels.  When cyclical  fluctuations
result in lower than expected revenue levels, operating results may be adversely
affected and cost reduction  measures may be necessary in order for us to remain
competitive and financially sound. During a down cycle, we must be in a position
to adjust our cost and expense  structure to prevailing market conditions and to
continue to motivate and retain our key employees.  In addition,  during periods
of  rapid  growth,  we  must  be able to  increase  manufacturing  capacity  and
personnel  to meet  customer  demand.  We can  provide no  assurance  that these
objectives can be met in a timely manner in response to industry  cycles.  If we
fail to respond to industry cycles, our business could be seriously harmed.

     We are currently in an industry down cycle. We are not able to predict when
the semiconductor industry will recover.  During a down cycle, the semiconductor
industry   typically   experiences   excess  production   capacity  that  causes
semiconductor  manufacturers to decrease capital  spending.  We generally do not
have long-term  volume  production  contracts with our customers,  and we do not
control the timing or volume of orders placed by our  customers.  Whether and to
what extent our customers place orders for any specific products, as well as the
mix and quantities of products included in those orders,  are factors beyond our
control.  Insufficient  orders,  especially  in our down cycles,  will result in
under-utilization  of our manufacturing  facilities and  infrastructure and will
negatively affect our operating results and financial condition.

International Trade and Economic Conditions

     We serve an increasingly global market. A majority of our annual revenue is
derived from outside the United States, and we expect that international revenue
will  continue  to  represent  a  substantial  percentage  of our  revenue.  Our
international  revenue  and  operations  are  affected  by  economic  conditions
specific to each country and region.  Because of our  significant  dependence on
international  revenue,  a decline in the  economies of any of the  countries or
regions in which we do business could negatively affect our operating results.

     Managing global operations and sites located  throughout the world presents
challenges   associated  with,  among  other  things,   cultural  diversity  and
organizational  alignment.  Moreover,  each  region in the global  semiconductor
equipment  market  exhibits  unique   characteristics  that  can  cause  capital
equipment  investment  patterns  to vary  significantly  from  period to period.
Periodic  local or  international  economic  downturns,  trade  balance  issues,
political  instability in regions where we have operations,  such as Israel, and
fluctuations in interest and currency exchange rates could negatively affect our
business  and results of  operations.  Although  we attempt to manage  near-term
currency risks through the use of hedging instruments, there can be no assurance
that such efforts will be adequate.

Competition

     Our industry  includes large  manufacturers  with substantial  resources to
support customers  worldwide.  Our future performance depends, in part, upon our
ability to continue to compete successfully  worldwide.  Some of our competitors
are diversified  companies with greater  financial  resources and more extensive
research, engineering, manufacturing, marketing and customer service and support
capabilities  than we can provide.  We face  competition  from  companies  whose
strategy  is to provide a broad array of products  and  services,  some of which
compete  with the products and services  that we offer.  These  competitors  may
bundle their products in a manner that may discourage  customers from purchasing
our  products.   In  addition,   we  face   competition  from  smaller  emerging
semiconductor  equipment companies whose strategy is to provide a portion of the
products and  services,  which we offer,  using  innovative  technology  to sell
products into specialized markets. Loss of competitive position could negatively
impact our prices, customer orders, revenue, gross margin, and market share, any
of which would negatively affect our operating results and financial  condition.
Our failure to compete  successfully  with these other companies would seriously
harm our business.

Technological Change and Customer Requirements

     Success  in the  semiconductor  equipment  industry  depends,  in part,  on
continual  improvement  of existing  technologies  and rapid  innovation  of new
solutions.  For example, the semiconductor industry continues to shrink the size
of semiconductor devices, transition to copper and other new materials, and move
toward  300-millimeter  wafers.  While we expect these trends will  increase our
customers' reliance on our diagnostic products,  we cannot ensure that they will
directly improve our business.  These and other evolving  customer needs require
us to respond with continued development programs and to cut back or discontinue
older  programs,  which  may no longer  have  industry-wide  support.  Technical
innovations  are  inherently  complex and require  long  development  cycles and
appropriate professional staffing. Our competitive advantage and future business
success depend on our ability to accurately predict evolving industry standards,
to develop and  introduce  new  products  which  successfully  address  changing
customer  needs,  to  win  market  acceptance  of  these  new  products  and  to
manufacture these new products in a timely and  cost-effective  manner. If we do
not develop and  introduce new products and  technologies  in a timely manner in
response to changing market  conditions or customer  requirements,  our business
could be seriously harmed.

     In this  environment,  we must continue to make significant  investments in
research and development in order to enhance the  performance and  functionality
of our products,  to keep pace with competitive products and to satisfy customer
demands for improved  performance,  features and functionality.  There can be no
assurance  that revenue  from future  products or product  enhancements  will be
sufficient to recover the  development  costs  associated  with such products or
enhancements or that we will be able to secure the financial resources necessary
to fund future development. Substantial research and development costs typically
are  incurred  before  we  confirm  the  technical  feasibility  and  commercial
viability  of  a  product,   and  not  all  development   activities  result  in
commercially viable products.  In addition, we cannot ensure that these products
or enhancements  will receive market  acceptance or that we will be able to sell
these  products  at  prices  that are  favorable  to us.  Our  business  will be
seriously harmed if we are unable to sell our products at favorable prices or if
the market in which we operate does not accept our products.

Key Suppliers

     We  use a wide  range  of  materials  in the  production  of our  products,
including  custom  electronic  and  mechanical  components,  and we use numerous
suppliers  to supply  materials.  We  generally  do not have  guaranteed  supply
arrangements  with our suppliers.  Because of the  variability and uniqueness of
customers'  orders,  we do not maintain an extensive  inventory of materials for
manufacturing.   We  seek  to  minimize  the  risk  of  production  and  service
interruptions  and/or  shortages  of  key  parts  by  selecting  and  qualifying
alternative  suppliers for key parts,  monitoring the financial stability of key
suppliers and maintaining appropriate inventories of key parts. Although we make
reasonable  efforts to ensure that parts are available from multiple  suppliers,
key parts may be  available  only from a single  supplier or a limited  group of
suppliers. Our business would be harmed if we do not receive sufficient parts to
meet our production requirements in a timely and cost-effective manner.

Manufacturing Disruption

     Most of our  manufacturing  facilities  are located in the US, with a small
operation located in Israel.  Operations at our manufacturing facilities and our
assembly  subcontractors  are  subject to  disruption  for a variety of reasons,
including work  stoppages,  acts of war,  terrorism,  fire,  earthquake,  energy
shortages,  flooding or other natural  disasters.  Such  disruption  could cause
delays  in  shipments  of  products  to our  customers.  We cannot  ensure  that
alternate  production  capacity would be available if a major disruption were to
occur or that, if it were  available,  it could be obtained on favorable  terms.
Such disruption  could result in cancellation of orders or loss of customers and
could seriously harm our business.

Intellectual Property Obsolescence and Infringement

     Our success is dependent in part on our  technology  and other  proprietary
rights.  We own  various  United  States  and  international  patents  and  have
additional  pending  patent  applications  relating to some of our  products and
technologies. The process of seeking patent protection is lengthy and expensive,
and we cannot be certain  that  pending  or future  applications  will  actually
result in issued patents or that issued  patents will be of sufficient  scope or
strength to provide meaningful  protection or commercial  advantage to us. Other
companies  and  individuals,  including  our  larger  competitors,  may  develop
technologies that are similar or superior to our technology or may design around
the patents we own.

     We also  maintain  trademarks  on certain of our  products and services and
claim copyright  protection for certain proprietary  software and documentation.
However,  we can give no assurance that our  trademarks  and copyrights  will be
upheld or successfully deter infringement by third parties.

     While  patent,  copyright  and trademark  protection  for our  intellectual
property is important,  we believe our future success in highly dynamic  markets
is most  dependent  upon the  technical  competence  and creative  skills of our
personnel.  We  attempt  to  protect  our trade  secrets  and other  proprietary
information  through  confidentiality  and other  agreements with our customers,
suppliers,  employees and  consultants and through other security  measures.  We
also  maintain  exclusive  and  non-exclusive  licenses  with third  parties for
strategic  technology  used  in  certain  products.  However,  these  employees,
consultants and third parties may breach these  agreements,  and we may not have
adequate remedies for wrongdoing.  In addition,  the laws of certain territories
in which we  develop,  manufacture  or sell our  products  may not  protect  our
intellectual  property  rights to the same extent,  as do the laws of the United
States.

     As is typical in the semiconductor equipment industry, from time to time we
have  received  communications  from other  parties  asserting  the existence of
patent  rights,  copyrights,  trademark  rights or other  intellectual  property
rights which they believe cover certain of our products, processes, technologies
or  information.  Our customary  practice is to evaluate such  assertions and to
consider whether to seek licenses where appropriate.  However,  we cannot ensure
that licenses can be obtained or, if obtained,  will be on  acceptable  terms or
that costly litigation or other  administrative  proceedings will not occur. The
inability to obtain necessary licenses or other rights on reasonable terms could
seriously harm our operating results and financial condition.

Key Employees

     Our employees are vital to our success, and our key management, engineering
and  other  employees  are  difficult  to  replace.  We  generally  do not  have
employment  contracts  with our key employees.  Further,  we do not maintain key
person life insurance on any of our employees.  The expansion of high technology
companies   worldwide  has  increased   demand  and  competition  for  qualified
personnel.  If we are unable to retain key  personnel,  or if we are not able to
attract,  assimilate or retain additional highly qualified employees to meet our
needs in the future, our business and operations could be harmed.  These factors
could seriously harm our business.

Acquisitions

     In  addition  to our  efforts to develop  new  technologies  from  internal
sources, we also seek to acquire new technologies from external sources. As part
of this effort,  we may make  acquisitions  of, or significant  investments  in,
businesses  with   complementary   products,   services   and/or   technologies.
Acquisitions  involve numerous risks,  including  management issues and costs in
connection  with the  integration of the operations and personnel,  technologies
and products of the acquired  companies,  the possible  write-downs  of impaired
assets, and the potential loss of key employees of the acquired  companies.  The
inability to manage these risks effectively could seriously harm our business.

Litigation

     From time to time we are involved in litigation of various types, including
litigation that alleges  infringement of intellectual  property rights and other
claims.  Litigation  tends to be expensive and requires  significant  management
time and attention and could have a negative effect on our results of operations
or business if we lose or have to settle a case on significantly  adverse terms.
If we lose in a dispute concerning  intellectual property, a court could require
us to pay  substantial  damages  and/or  royalties or could issue an  injunction
prohibiting us from using essential  technologies.  For these and other reasons,
this type of litigation  could have a material  adverse  effect on our business,
financial  condition and results of  operations.  Also,  although we may seek to
obtain a license under a third party's intellectual  property rights in order to
bring an end to certain  claims or actions  asserted  against  us, we may not be
able to obtain such a license on reasonable terms or at all.

Terrorism and Political Instability

     The threat of terrorism targeted at the regions of the world in which we do
business,  including the United States, increases the uncertainty in our markets
and may delay any recovery in the general economy.  Any delay in the recovery of
the economy and the semiconductor industry could seriously impact our business.

     Increased  international  political  instability,  as  demonstrated  by the
September 2001 terrorist  attacks,  disruption in air transportation and further
enhanced security measures as a result of the terrorist attacks,  and the threat
of war in Iraq, may hinder our ability to do business and may increase our costs
of operations.  Such  continuing  instability  could cause us to incur increased
costs in  transportation,  make such  transportation  unreliable,  increase  our
insurance costs,  and cause  international  currency markets to fluctuate.  This
same instability  could have the same effects on our suppliers and their ability
to timely deliver their products.  If this international  political  instability
continues or increases, our business and results of operations could be harmed.

Effects of Recent Accounting Pronouncements

     We have adopted SFAS No. 143,  "Accounting for Obligations  Associated with
the  Retirement  of  Long-Lived  Assets"  and SFAS No. 144  "Accounting  for the
Impairment  of  Disposal  of  Long-Lived  Assets".   SFAS  No.  143  establishes
accounting  standards for the recognition and measurement of an asset retirement
obligation and its associated asset  retirement cost. It also provides  guidance
for legal  obligations  associated  with the  retirement of tangible  long-lived
assets. SFAS No. 144 establishes a single accounting model for the impairment or
disposal of long-lived assets,  including discontinued  operations.  Adoption of
these  pronouncements  did not have a  significant  effect  on our  consolidated
financial statements.

     In June 2002, the FASB issued  Statement No. 146 ("SFAS 146"),  "Accounting
for Costs  Associated  with Exit or  Disposal  Activities."  SFAS 146  addresses
financial  accounting and reporting for costs  associated  with exit or disposal
activities,  and  nullifies  Emerging  Issues Task Force  (EITF) Issue No. 94-3,
Liabilities  Recognition  for Certain  Employee  Termination  Benefits and Other
Costs to Exit an Activity (including Certain Costs Incurred in a Restructuring).
This Statement  requires that a liability for costs  associated  with an exit or
disposal  activity be recognized and measured  initially at fair value only when
the  liability  is  incurred.  SFAS 146 will be  effective  for exit or disposal
activities  that are  initiated  after  December 31, 2002.  The standard will in
certain circumstances change the timing of recognition of restructuring costs.

     In November 2002, the Emerging Issues Task Force (EITF) reached a consensus
on  Issue  No.  00-21,   "Accounting  for  Revenue  Arrangements  with  Multiple
Deliverables."  This issue  addresses  determination  of whether an  arrangement
involving  more than one  deliverable  contains more than one unit of accounting
and how  arrangement  consideration  should be  measured  and  allocated  to the
separate units of accounting. EITF Issue No. 00-21 will be effective for revenue
arrangements  entered into in fiscal periods beginning after June 15, 2003 or we
may elect to report the change in accounting as a cumulative-effect  adjustment.
We are  reviewing  EITF Issue No. 00-21 and have not yet  determined  the impact
this  issue  will  have on our  consolidated  operating  results  and  financial
position.

     In December  2002,  FASB issued SFAS 148, an  Amendment  of SFAS 123.  This
Statement amends SFAS 123, to provide  alternative  methods of transition for an
entity that voluntarily changes to the fair value based method of accounting for
stock-based employee  compensation.  It also amends the disclosure provisions of
that Statement to require prominent disclosure about the effects on reported net
income of an entity's  accounting  policy  decisions with respect to stock-based
employee  compensation.  Finally,  this  Statement  amends APB  Opinion  No. 28,
Interim  Financial  Reporting,  to require  disclosure  about  those  effects in
interim  financial  information.  Since we are  continuing to account for stock-
based compensation according to APB 25, our adoption of SFAS 148 will require us
to provide  prominent  disclosures  about the  effects  of SFAS 123 on  reported
income and will require us to disclose these affects in our interim consolidated
financial  statements as well.  SFAS 148 is effective for interim fiscal periods
beginning after December 15, 2002. We believe that the adoption of this standard
will have no material impact on our consolidated operating results and financial
position.

         In January 2003, the FASB issued FIN 46, "Consolidation of Variable
Interest Entities", an Interpretation of ARB No. 51. FIN 46 requires certain
variable interest entities to be consolidated by the primary beneficiary of the
entity if the equity investors in the entity do not have the characteristics of
a controlling financial interest or do not have sufficient equity at risk for
the entity to finance its activities without additional subordinated financial
support from other parties. FIN 46 is effective immediately for all new variable
interest entities created or acquired after January 31, 2003. For variable
interest entities created or acquired prior to February 1, 2003, the provisions
of FIN 46 must be applied for the first interim or annual period beginning after
June 15, 2003. We believe that the adoption of this standard will have no
material impact on our consolidated financial statements.


ITEM 3.     QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     We are exposed to financial  market  risks,  including  changes in interest
rates, foreign currency exchange rates and marketable equity security prices. To
mitigate these risks, we utilize derivative financial instruments. We do not use
derivative financial instruments for speculative or trading purposes. All of the
potential changes noted below are based on sensitivity analyses performed on our
financial position at December, 31, 2003. Actual results may differ materially.

     As of December 31,  2002,  we had an  investment  portfolio of fixed income
securities  of  $738  million  excluding  those  classified  as  cash  and  cash
equivalents. These securities, as with all fixed income instruments, are subject
to interest rate risk and will fall in value if market  interest rates increase.
If market interest rates were to increase  immediately and uniformly by 10% from
levels as of December 31, 2002, the fair value of our investment portfolio would
decline by $3 million.

     As of December 31, 2002, we had net forward  contracts to sell U.S.  dollar
equivalent  of $117  million in foreign  currency in order to hedge our currency
exposures. If we had entered into these contracts on December 31, 2002, the U.S.
dollar equivalent would be $120 million. A 10% adverse move in currency exchange
rates  affecting the contracts would decrease the fair value of the contracts by
$15  million.  However,  if this  occurred,  the fair  value  of the  underlying
exposures   hedged  by  the  contracts  would  increase  by  a  similar  amount.
Accordingly,  we believe that our hedging  strategy should yield no material net
impact to net income or cash flows.

Item 4. CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures

     Within 90 days prior to the date of this report (the Evaluation  Date), the
Company's Chief Executive Officer  (principal  executive  officer) and Executive
Vice  President  and Chief  Financial  Officer  (principal  financial  officer),
carried out an evaluation  of the  effectiveness  of the  Company's  "disclosure
controls  and  procedures"  (as defined in the  Securities  Exchange Act of 1934
Rules 13a-14(c) and 15(d)-14(c)).  Based on that evaluation, these officers have
concluded that as of the Evaluation Date, the Company's  disclosure controls and
procedures  were  adequate  and  designed  to ensure that  material  information
relating to the Company and the  Company's  consolidated  subsidiaries  would be
made known to them by others  within those  entities and are effective to ensure
that the  information  required to be disclosed by us in reports that we file or
submit under the  Securities  Exchange Act of 1934 is  recorded,  processed  and
reported within the time periods specified in Securities and Exchange Commission
rules and forms.

Changes in internal controls

     There have been no significant  changes in the Company's  internal controls
or in other factors that could significantly affect these controls subsequent to
the date of their evaluation.






                           PART II. OTHER INFORMATION


ITEM 1.    LEGAL PROCEEDINGS

     A discussion  regarding  certain  pending legal  proceedings is included in
Part I, Item 3, "Legal Proceedings,"  included in our Annual Report on Form 10-K
for the fiscal  year ended June 30,  2002.  Since the fiscal year ended June 30,
2002,  certain  developments have occurred with respect to the legal proceedings
described in our Annual Report as follows:

     ADE Corporation

     On October 11, 2000, ADE Corporation ("ADE"), a competitor,  filed a patent
infringement  lawsuit against KLA-Tencor in the U.S. District Court in Delaware.
ADE claimed  damages and sought an injunction  under U.S.  Patent No.  6,118,525
(`525 patent).  We filed a counterclaim  in the same court alleging that ADE has
infringed four of our patents. We are seeking damages and a permanent injunction
against ADE. In addition,  we are seeking a declaration  from the District Court
that ADE's  patent is invalid and not  infringed by  KLA-Tencor.  On October 22,
2001, we filed a separate  action for  declaratory  judgment  against ADE in the
Northern  District of California  requesting a declaration  that U.S. Patent No.
6,292,259  (`259 patent) is invalid and not infringed.  That action has now been
consolidated  with the prior  action  in the  Delaware  proceeding,  and ADE has
amended its complaint in that proceeding to allege that KLA-Tencor is infringing
the `259 patent.  On August 8, 2002,  the  magistrate  presiding over the action
issued a  recommendation  that the  court  enter  summary  judgment  in favor of
KLA-Tencor on the issue of non-infringement under ADE's `525 patent. On the same
day, the magistrate issued recommendations that the court enter summary judgment
in favor of ADE on the issue of non-infringement of two of KLA-Tencor's patents.
While we cannot predict the outcome,  we believe that we have valid defenses and
further believe that our counterclaims have merit.

     Tokyo Seimitsu Co. Ltd.

     On June 27,  2001,we  sued Tokyo  Seimitsu  Co. Ltd.  and TSK America  Inc.
("TSK"),  a competitor,  in the U.S.  District Court in the Northern District of
California alleging that TSK infringes on one of the Company's patents. The suit
seeks damages and an injunction  under U.S. Patent No.  4,805,123 (`123 patent).
TSK filed a counterclaim  in the same court seeking a declaration  that the `123
patent is invalid,  unenforceable and not infringed, and also alleged violations
of the  antitrust  and unfair  competition  laws.  While we cannot  predict  the
outcome  of this  matter,  we  believe  that we have  valid  defenses  to  TSK's
counterclaim and believe that our suit has merit


     Schlumberger, Inc. and Rigg Systems, Inc.

     The Schlumberger,  Inc. and Rigg Systems,  Inc. actions have been dismissed
under circumstances that the parties have agreed to treat as confidential.


     Although we cannot  predict the outcome of these claims,  we do not believe
that  any of  these  legal  matters  will  have a  material  adverse  effect  on
KLA-Tencor.  Were an  unfavorable  ruling to occur in one or more of the pending
claims,  there  exists the  possibility  of a material  impact on our  operating
results for the period in which the ruling occurred.


ITEM 4.    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     The Annual Meeting of  Stockholders  of KLA-Tencor  Corporation was held on
November  8, 2002 at the  Company's  offices  in  Milpitas,  California.  Of the
189,113,780  shares of Common Stock  outstanding  as of September  16, 2002 (the
record date),  162,144,959  shares (85.74%) were present or represented by proxy
at the meeting.

1. The table below presents the results of the election to the Company's board
   of directors.

                                                                           Votes
                                               Votes for                Withheld

Kenneth Levy                                 140,243,236              21,901,723
Jon D. Tompkins                              160,412,904               1,732,055
Lida Urbanek                                 155,675,306               6,469,653
Stephen P. Kaufman                           160,438,664               1,706,295

     The terms of H. Raymond  Bingham,  Robert T. Bond,  Richard J. Elkus,  Jr.,
Edward W.  Barnholt  and  Kenneth L.  Schroeder  as  directors  of the  Company,
continued after the meeting.

2. The stockholders  ratified the appointment of  PricewaterhouseCoopers  LLP as
the Company's  independent  accountants for the fiscal year ended June 30, 2003.
This  proposal  received  151,540,212  votes for,  9,781,014  votes  against and
823,733 abstentions.


ITEM 6.    EXHIBITS AND REPORTS ON FORM 8-K

(a)      Exhibits

         99.1  Certification of the Chief Executive Officer pursuant to Section
               906 of the  Sarbanes-Oxley Act of 2002


         99.2  Certification of the Chief Financial Officer pursuant to Section
               906 of the  Sarbanes-Oxley Act of 2002

(b)      Form 8-K

         None








SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                                          KLA-Tencor Corporation
                                                                    (Registrant)



February 13, 2003                                    /s/  KENNETH L. SCHROEDER
- -------------------                    -----------------------------------------
         (Date)                                         Kenneth L. Schroeder
                                                      Chief Executive Officer
                                                   (Principal Executive Officer)




February 13, 2003                                           /s/ JOHN H. KISPERT
- -------------------------------        -----------------------------------------
         (Date)                                           John H. Kispert
                                                      Executive Vice President
                                                   and Chief Financial Officer
                                                 (Principal Accounting Officer)





CERTIFICATIONS

I, Kenneth L. Schroeder certify that:

1.   I have reviewed this quarterly report on Form 10-Q of KLA-Tencor
     Corporation;

2.   Based on my knowledge, this quarterly report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this quarterly report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the registrant as of, and for, the periods presented in this
     quarterly report;

4.   The registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

     a)  designed such disclosure controls and procedures to ensure that
         material information relating to the registrant, including its
         consolidated subsidiaries, is made known to us by others within those
         entities, particularly during the period in which this quarterly report
         is being prepared;

     b)  evaluated the effectiveness of the registrant's disclosure controls and
         procedures as of a date within 90 days prior to the filing date of this
         quarterly report (the "Evaluation Date"); and

     c)  presented in this quarterly report our conclusions about the
         effectiveness of the disclosure controls and procedures based on our
         evaluation as of the Evaluation Date;

5.  The registrant's other certifying officers and I have disclosed, based on
    our most recent evaluation, to the registrant's auditors and the audit
    committee of registrant's board of directors (or persons performing the
    equivalent function):

     a)  all significant deficiencies in the design or operation of internal
         controls which could adversely affect the registrant's ability to
         record, process, summarize and report financial data and have
         identified for the registrant's auditors any material weaknesses in
         internal controls; and

     b)  any fraud, whether or not material, that involves management or other
         employees who have a significant role in the registrant's internal
         controls; and

6.   The registrant's other certifying officers and I have indicated in this
     quarterly report whether or not there were significant changes in internal
     controls or in other factors that could significantly affect internal
     controls subsequent to the date of our most recent evaluation, including
     any corrective actions with regard to significant deficiencies and material
     weaknesses.

February 13, 2003                                /s/  KENNETH L. SCHROEDER
- -------------------                 --------------------------------------------
         (Date)                                      Kenneth L. Schroeder
                                                   Chief Executive Officer
                                                (Principal Executive Officer)





I, John H. Kispert certify that:

1.   I have reviewed this quarterly report on Form 10-Q of KLA-Tencor
     Corporation;

2.   Based on my knowledge, this quarterly report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this quarterly report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the registrant as of, and for, the periods presented in this
     quarterly report;

4.   The registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

     a)  designed such disclosure controls and procedures to ensure that
         material information relating to the registrant, including its
         consolidated subsidiaries, is made known to us by others within those
         entities, particularly during the period in which this quarterly report
         is being prepared;

     b)  evaluated the effectiveness of the registrant's disclosure controls and
         procedures as of a date within 90 days prior to the filing date of this
         quarterly report (the "Evaluation Date"); and

     c)  presented in this quarterly report our conclusions about the
         effectiveness of the disclosure controls and procedures based on our
         evaluation as of the Evaluation Date;

5.  The registrant's other certifying officers and I have disclosed, based on
    our most recent evaluation, to the registrant's auditors and the audit
    committee of registrant's board of directors (or persons performing the
    equivalent function):

     a)  all significant deficiencies in the design or operation of internal
         controls which could adversely affect the registrant's ability to
         record, process, summarize and report financial data and have
         identified for the registrant's auditors any material weaknesses in
         internal controls; and

     b)  any fraud, whether or not material, that involves management or other
         employees who have a significant role in the registrant's internal
         controls; and

6.   The registrant's other certifying officers and I have indicated in this
     quarterly report whether or not there were significant changes in internal
     controls or in other factors that could significantly affect internal
     controls subsequent to the date of our most recent evaluation, including
     any corrective actions with regard to significant deficiencies and material
     weaknesses.

February 13, 2003                                       /s/ JOHN H. KISPERT
- -------------------                         ------------------------------------
         (Date)                                            John H. Kispert
                                                      Executive Vice President
                                                    and Chief Financial Officer
                                                  (Principal Accounting Officer)