SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                           __________________________

                                    FORM 10-Q

              (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  For the quarterly period ended March 31, 2000

                                       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 0-25346

                      TRANSACTION SYSTEMS ARCHITECTS, INC.
             (Exact name of registrant as specified in its charter)


                               Delaware 47-0772104
                         (State or other jurisdiction of
                                (I.R.S. Employer
                         incorporation or organization)
                              Identification No.)

                             224 South 108th Avenue
                              Omaha, Nebraska 68154
          (Address of principal executive offices, including zip code)

                                 (402) 334-5101
              (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 Exchange 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_____

  Indicate the number of shares outstanding of each of the issuer's classes of
                common stock as of the latest practicable date:


            32,992,959 shares of Class A Common Stock at May 8, 2000

                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                                    FORM 10-Q
                  FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2000
                                TABLE OF CONTENTS

                                                                        Page
                         Part I - FINANCIAL INFORMATION

Item 1.  Condensed Consolidated Balance Sheets as of
         March 31, 2000 and September 30, 1999                          3

         Condensed Consolidated Statements of Income for the
         three and six months ended March 31, 2000 and 1999             4

         Condensed Consolidated Statements of Cash Flows for
         the six months ended March 31, 2000 and 1999                   5

         Notes to Condensed Consolidated Financial Statements           6 - 8

Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations                            9 - 12

Item 3.  Quantitative and Qualitative Disclosures about Market Risk     12


                           Part II - OTHER INFORMATION

Item 1.  Legal Proceedings                                              13

Item 4.  Submission of Matters to a Vote of Security Holders            13

Item 6.  Exhibits and Reports on Form 8-K                               13

Signatures                                                              14

Index to Exhibits                                                       15



                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                          (unaudited and in thousands)


                                                              March 31,             September 30,
                                                                2000                    1999
                                                            -------------          --------------
                                                                            
                                         ASSETS
Current assets:
        Cash and cash equivalents                          $    40,801             $    70,482
        Marketable securities                                   24,141                   8,456
        Billed receivables, net                                 51,943                  50,619
        Accrued receivables                                     44,534                  41,880
        Refundable income taxes                                  4,806                       -
        Deferred income taxes                                        -                   1,164
        Other                                                   11,409                   7,215
                                                            ------------            ------------

               Total current assets                            177,634                 179,816

Property and equipment, net                                     19,679                  20,754
Software, net                                                   25,969                  25,835
Intangible assets, net                                          57,569                  61,612
Long-term accrued receivables                                   23,614                  26,850
Investments and notes receivable                                 4,650                   3,569
Deferred income taxes                                            2,438                      97
Other                                                            6,166                   4,785
                                                            ------------            ------------

               Total assets                                $   317,719             $   323,318
                                                            ============            ============

                          LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
        Current portion of long-term debt                  $       718             $       501
        Accounts payable                                        10,424                   8,030
        Accrued employee compensation                            4,582                   7,192
        Accrued liabilities                                     15,295                  18,287
        Deferred income taxes                                    3,689                       -
        Income taxes                                                 -                   8,521
        Deferred revenue                                        56,438                  54,627
                                                            ------------            ------------

               Total current liabilities                        91,146                  97,158

Long-term debt                                                     851                     991
                                                            ------------            ------------

               Total liabilities                                91,997                  98,149
                                                            ------------            ------------

Stockholders' equity:
        Class A Common Stock                                       164                     163
        Additional paid-in capital                             165,602                 161,630
        Retained earnings                                       83,090                  82,922
        Treasury stock, at cost                                (27,593)                (14,250)
        Accumulated other comprehensive income                   4,459                  (5,296)
                                                            ------------            ------------

               Total stockholders' equity                      225,722                 225,169
                                                            ------------            ------------

               Total liabilities and stockholders' equity  $   317,719             $   323,318
                                                            ============            ============

  See notes to condensed consolidated financial statements.




                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                   CONDENSED CONSOLIDATED STATEMENTS OF INCOME
             (unaudited and in thousands, except per share amounts)

                                                           Three Months Ended March 31,           Six Months Ended March 31,
                                                         -------------------------------      ---------------------------------
                                                             2000               1999               2000                1999
                                                         ------------       ------------       ------------        ------------
                                                                                                     
  Revenues:
        Software license fees                           $     46,508       $     50,552       $     81,761        $     96,629
        Maintenance fees                                      17,204             15,996             33,889              31,563
        Services                                              11,677             19,309             26,856              42,604
        Hardware, net                                              -              1,094                  -               2,225
                                                         ------------       ------------       ------------        ------------

             Total revenues                                   75,389             86,951            142,506             173,021
                                                         ------------       ------------       ------------        ------------

  Expenses:

        Cost of software license fees                         11,084              9,950             21,909              21,772
        Cost of maintenance and services                      17,264             18,038             34,056              38,331
        Research and development                               9,968              8,538             18,428              16,736
        Selling and marketing                                 18,204             17,348             35,765              33,326
        General and administrative costs                      15,159             14,976             29,797              29,345
        Amortization of goodwill and
            purchased intangibles                              1,758              1,104              3,935               1,548
                                                         ------------       ------------       ------------        ------------

             Total  expenses                                  73,437             69,954            143,890             141,058
                                                         ------------       ------------       ------------        ------------

  Operating income (loss)                                      1,952             16,997             (1,384)             31,963
                                                         ------------       ------------       ------------        ------------

  Other income (expense):
        Interest income                                          717                721              1,664               1,424
        Interest expense                                         (72)               (48)              (135)               (159)
        Transaction related expenses                               -                  -                  -                (653)
        Other                                                    (51)               (29)               132                 168
                                                         ------------       ------------       ------------        ------------

             Total other                                         594                644              1,661                 780
                                                         ------------       ------------       ------------        ------------

  Income before income taxes                                   2,546             17,641                277              32,743
  Provision for income taxes                                    (995)            (6,757)              (109)            (12,489)
                                                         ------------       ------------       ------------        ------------

  Net income                                            $     1,551        $     10,884       $        168        $     20,254
                                                         ============       ============       ============        ============

  Earnings Per Share Data:
        Basic:
             Net income                                 $       0.05       $       0.35       $       0.01        $       0.65
                                                         ============       ============       ============        ============

             Average shares outstanding                       31,707             31,440             31,873              31,189
                                                         ============       ============       ============        ============

        Diluted:
             Net income                                 $       0.05       $       0.34       $       0.01        $       0.63
                                                         ============       ============       ============        ============

             Average shares outstanding                       32,172             32,265             32,364              31,996
                                                         ============       ============       ============        ============

  See notes to condensed consolidated financial statements.




                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                          (unaudited and in thousands)

                                                                                        Six months ended March 31,
                                                                                    ----------------------------------
                                                                                        2000                   1999
                                                                                    ------------          ------------
                                                                                                  
Cash flows from operating activities:
      Net  income                                                                  $        168          $     20,254
      Adjustments to reconcile net income to net cash
        provided by operating activities:
           Depreciation                                                                   4,079                 3,984
           Amortization                                                                  10,026                 4,263
           Changes in operating assets and liabilities:
           Billed and accrued receivables                                                (1,083)               (9,630)
           Other current and noncurrent assets                                          (12,130)               (8,212)
           Accounts payable                                                               2,356                (1,516)
           Deferred revenue                                                               1,593                 6,883
           Other current liabilities                                                    (11,422)               (6,385)
                                                                                    ------------          ------------

                     Net cash provided by (used in) operating activities                 (6,413)                9,641
                                                                                    ------------          ------------

Cash flows from investing activities:
      Purchases of property and equipment                                                (3,368)               (2,796)
      Purchases of software                                                              (5,670)               (3,526)
      Acquisition of businesses, net of cash acquired                                    (3,053)               (5,065)
      Additions to investment and notes receivable                                       (1,081)                 (602)
                                                                                    ------------          ------------

                     Net cash used in investing activities                              (13,172)              (11,989)
                                                                                    ------------          ------------

Cash flows from financing activities:
      Proceeds from issuance of Class A Common Stock                                        931                   755
      Proceeds from exercise of stock options                                             1,661                 1,665
      Purchase of Class A Common Stock                                                  (13,343)                    -
      Changes in long-term debt, net                                                         77                (1,168)
                                                                                    ------------          ------------

                     Net cash provided by (used in) financing activities                (10,674)                1,252
                                                                                    ------------          ------------

Effect of exchange rate fluctuations on cash                                                578                    13
                                                                                    ------------          ------------

Decrease in cash and cash equivalents                                                   (29,681)               (1,083)

Cash and cash equivalents, beginning of period                                           70,482                63,648
                                                                                    ------------          ------------

Cash and cash equivalents, end of period                                           $     40,801          $     62,565
                                                                                    ============          ============

See notes to condensed consolidated financial statements.


                      TRANSACTION SYSTEMS ARCHITECTS, INC.
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1.  Consolidated Financial Statements
Transaction  Systems  Architects,  Inc. (the Company or TSA) develops,  markets,
installs and supports a broad line of software  products and services  primarily
focused  on  facilitating   electronic  payments  and  electronic  commerce.  In
addition to its own products,  the Company  distributes or acts as a sales agent
for software  developed by third parties.  The products are used  principally by
financial institutions,  retailers and third-party processors,  both in domestic
and international markets.

The condensed  consolidated  financial  statements at March 31, 2000 and for the
three and six months  ended  March 31, 2000 and 1999 are  unaudited  and reflect
all adjustments  (consisting  only of normal recurring  adjustments)  which are,
in  the  opinion  of  management,  necessary  for a  fair  presentation  of  the
financial   position  and  operating  results  for  the  interim  periods.   The
condensed  consolidated  financial statements should be read in conjunction with
the  consolidated   financial  statements  and  notes  thereto,   together  with
management's  discussion  and  analysis of  financial  condition  and results of
operations,  contained  in the  Company's  Annual  Report  on Form  10-K for the
fiscal year ended  September 30, 1999.  The results of operations  for the three
and six  months  ended  March 31,  2000 are not  necessarily  indicative  of the
results for the entire fiscal year ending September 30, 2000.

2.  Comprehensive Income
The  Company's  components  of other  comprehensive  income  were as follows (in
thousands):



                                                  Three Months Ended March 31,         Six Months Ended March 31,
                                                -------------------------------      -------------------------------
                                                    2000               1999                2000              1999
                                                ------------       ------------      ------------       ------------
                                                                                          
 Net Income                                    $      1,551       $     10,884      $        168       $     20,254
 Other Comprehensive income:
      Unrealized investment holding gain              6,080                625            10,767                157
      Foreign currency translation adjustments          111             (1,387)           (1,012)            (1,890)
                                                ------------       ------------      ------------       ------------
 Comprehensive Income                          $      7,742       $     10,122      $      9,923       $    18,521
                                                ============       ============      ============       ============


Components  of  accumulated  other  comprehensive  income at each balance  sheet
date were as follows (in thousands):


                                                                     March 31,       September 30,
                                                                       2000              1999
                                                                   ------------      -------------
                                                                             
 Unrealized investment holding gain (loss)                        $      7,724      $      (3,043)
 Foreign currency translation adjustments                               (3,265)            (2,253)
                                                                   ------------      -------------
                                                                  $      4,459      $      (5,296)
                                                                   ============      =============


As of May 10, 2000,  the fair value of the marketable  securities  declined from
$24.1 million at March 31, 2000 to approximately $12.7 million.

3.  Revenue Recognition
The Company  accounts  for revenue in  accordance  with  American  Institute  of
Certified  Public  Accountants  Statement of Position  97-2,  "Software  Revenue
Recognition"  (SOP 97-2).  The Company has concluded  that for certain  software
arrangements  entered  into  after  October 1,  1998  with  extended  guaranteed
payment  terms,  the "fixed or  determinable"  presumption  of SOP 97-2 has been
overcome and software  license fees should be recognized  upon meeting all other
SOP 97-2  revenue  recognition  criteria  ("guaranteed  software license fees").
The present value of the  guaranteed  software  license fees  recognized  during
the three  months  ended March 31, 2000 and 1999  totaled $5.4 million and $11.9
million,  respectively.  The present value of the  guaranteed  software  license
fees  recognized  during the six months  ended March 31,  2000 and 1999  totaled
$10.5  million  and $18.6  million,  respectively.  The  discount  rates used to
determine  the  present  value  of  the   guaranteed   software   license  fees,
representing  the Company's  incremental  borrowing  rates,  ranged from 9.5% to
11.0%.  The  portion  of the  guaranteed  software  license  fees  that has been
recognized  by the  Company,  but  not  yet  billed,  is  reflected  in  accrued
receivables in the accompanying condensed consolidated balance sheets.

4.  Earnings Per Share
Basic  earnings  per share is  computed  using the  weighted  average  number of
shares  outstanding  during the period.  Diluted  earnings per share is computed
on the basis of the weighted  average number of common shares  outstanding  plus
the dilutive  effect of  outstanding  stock options  using the "treasury  stock"
method.

The following  table sets forth the  computation  of basic and diluted  earnings
per share (in thousands):


                                                       Three Months Ended March 31,        Six Months Ended March 31,
                                                      ------------------------------     ------------------------------
                                                          2000              1999             2000              1999
                                                      ------------      ------------     ------------      ------------
                                                                                             

 Net Income                                          $      1,551      $     10,884     $        168      $     20,254
                                                      ============      ============     ============      ============

 Weighted average shares outstanding                       31,707            31,440           31,873            31,189
 Dilutive effect of stock options                             465               825              491               807
                                                      ------------      ------------     ------------      ------------
 Dilutive shares outstanding                               32,172            32,265           32,364            31,996
                                                      ------------      ------------     ------------      ------------

Basic earnings per share                             $       0.05      $       0.35     $       0.01      $       0.65
                                                      ============      ============     ============      ============

Diluted earnings per share                           $       0.05      $       0.34     $       0.01      $       0.63
                                                      ============      ============     ============      ============

For the three months ended March 31, 2000 and 1999,  stock options  representing
1,366,291 and 19,763 shares of the Company's  common stock,  respectively,  have
been  excluded  from  the  computation  of  diluted  earnings  per  share as the
exercise  price of the stock options were greater than the average  market price
of the common  stock.  For the six months  ended March 31, 2000 and 1999,  stock
options  representing  1,349,679  and  17,629  shares  of the  Company's  common
stock,  respectively,  have  been  excluded  from  the  computation  of  diluted
earnings  per share as the  exercise  price of the stock  options  were  greater
than the average market price of the common stock.

5.  Segment Information
During the second  quarter of fiscal 2000,  the Company  announced the formation
of six new business units  organized on the basis of the Company's  products and
services.  As a result,  the Company has changed from  reporting  one segment in
its annual  report on Form 10-K for the fiscal year ended  September 30, 1999 to
reporting  six  segments.  These  reportable  segments  are:  Consumer  Banking,
Corporate  Banking  e-Payments,  Electronic  Business  Infrastructure,  Internet
Banking,  Electronic  Commerce  and Health  Claims  Transaction  Processing  and
Management.  A summary of the  products  and related  services  associated  with
each reportable segment is as follows:

o        Consumer  Banking  products  focus on the  consumer  side of  financial
         institutions  related  to  automated  teller  machine  (ATM)  networks,
         point-of-sale   deployments,   branch  networks,  home  banking,  fraud
         detection and back-office payments management.
o        Corporate  Banking  e-Payments  products offer electronic  commerce and
         electronic payments solutions to corporate banking institutions.
o        Electronic Business Infrastructure  products facilitate  communication,
         data movement,  transaction  processing and systems  monitoring  across
         incompatible   computing  systems  involving  mainframes,   distributed
         computing networks and the Internet.
o        Internet  Banking  products  offer banking and bill payments  solutions
         to large financial institutions as well as small community banks.
o        Electronic  Commerce  products  offer  retailers,  merchant  banks  and
         payment   processors   electronic  payment  solutions  such  as  secure
         web-based payments, debit and credit transaction  authorization,  fraud
         management and targeted marketing programs.
o        Health  Claims  Transaction   Processing  and  Management  allow  large
         companies  and  healthcare   payment   processors  to  automate  claims
         eligibility determination, claims capture and claims payments.

In  evaluating   segment   performance,   management   focuses  on  income  from
operations.  The table below  presents  revenues and  operating  income for each
reportable segment.



                                                                      Three months ended                   Six months ended
                                                                            March 31,                          March 31,
                                                                -------------------------------     ------------------------------
                                                                    2000               1999             2000               1999
                                                                ------------       ------------     ------------      ------------
                                                                                                        
Segment revenues:
  Consumer Banking                                             $     45,959       $     59,834     $     84,520      $    113,530
  Corporate Banking e-Payments                                        9,609              7,262           17,250            15,390
  Electronic Business Infrastructure                                 11,290              8,989           22,166            20,912
  Internet Banking                                                    2,178              2,806            6,131             5,176
  Electronic Commerce                                                 5,492              7,027           10,694            16,062
  Health Claims Transaction Processing and Management                   861              1,033            1,745             1,951
                                                                ------------       ------------     ------------      ------------
    Total consolidated revenue                                 $     75,389       $     86,951     $    142,506      $    173,021
                                                                ============       ============     ============      ============

Segment operating income (loss):
  Consumer Banking                                             $      2,233       $     17,074     $       (798)     $     28,465
  Corporate Banking e-Payments                                        1,206             (1,376)             498            (1,879)
  Electronic Business Infrastructure                                  2,428                957            4,212             2,314
  Internet Banking                                                     (570)               639              324               887
  Electronic Commerce                                                (3,280)              (442)          (5,595)            1,818
  Health Claims Transaction Processing and Management                   (65)               145              (25)              358
                                                                ------------       ------------     ------------      ------------
    Total consolidated operating income (loss)                 $      1,952       $     16,997     $     (1,384)     $     31,963
                                                                ============       ============     ============      ============

The  Company  currently  does  not  track  total  assets  and  expenditures  for
long-lived assets separately for each reportable segment.

Revenue and identifiable assets by geographic area are as follows:


                                                                       Three months ended                  Six months ended
                                                                            March 31,                          March 31,
                                                                --------------------------------    ------------------------------
                                                                    2000               1999             2000               1999
                                                                ------------       ------------     -------------     ------------
                                                                                                        
Revenues:
  United States                                                $     35,240       $     40,908     $      66,062     $     83,619
  Americas - other                                                    8,310             11,334            17,176           19,959
                                                                ------------       ------------     -------------     ------------
    Total Americas                                                   43,550             52,242            83,238          103,578
      EMEA                                                           24,584             25,715            44,806           53,424
      Asia/Pacific                                                    7,255              8,994            14,462           16,019
                                                                ------------       ------------     -------------     ------------
                                                               $     75,389       $     86,951     $     142,506     $    173,021
                                                                ============       ============     =============     ============


                                                                                    March 31,       September 30,
                                                                                      2000              1999
                                                                                   ------------     -------------
 Long-lived assets
       Americas                                                                   $    100,707     $     103,425
       EMEA                                                                             11,889            11,520
       Asia/Pacific                                                                      1,437             1,620
                                                                                   ------------     -------------
                                                                                  $    114,033     $     116,565
                                                                                   ============     =============


6.  Accounting Pronouncements Issued But Not Yet Effective
In December 1999, the Securities and Exchange Commission issued Staff Accounting
Bulletin No. 101 (SAB 101), "Revenue Recognition in Financial  Statements".  The
Company  will be required to adopt SAB 101 for fiscal  2001.  SAB 101  requires,
among other things,  that license and other up-front fees be recognized over the
term of the agreement, unless the fees are in exchange for products delivered or
services  performed  that  represent  the  culmination  of a  separate  earnings
process. The Company does not expect this change in accounting principle to have
a material effect on the Company's financial position and results of operation.

In  March  2000,   the  Financial   Accounting   Standards   Board  issued  FASB
Interpretation  No. 44,  "Accounting  for Certain  Transactions  involving Stock
Compensation,  an  interpretation  of APB Opinion No.  25".  The  Interpretation
clarifies the  application  of APB Opinion No. 25 for certain  issues  involving
employee stock  compensation.  The Interpretation is generally effective July 1,
2000.  Adoption of this  Interpretation  is not  expected to have a  significant
effect on the Company's consolidated financial statements.



                      TRANSACTION SYSTEMS ARCHITECTS, INC.
           MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                            AND RESULTS OF OPERATIONS

Results of Operations

The following  table sets forth  certain  financial  data and the  percentage of
total revenues of the Company for the periods indicated:

                                             Three Months Ended March 31,                    Six Months Ended March 31,
                                     ----------------------------------------------   ---------------------------------------------
                                             2000                       1999                 2000                    1999
                                     ---------------------    ---------------------   ---------------------   ---------------------
                                                   % of                    % of                    % of                    % of
                                       Amount     Revenue       Amount     Revenue      Amount     Revenue      Amount     Revenue
                                     ----------  ---------    ----------  ---------   ----------  ---------   ----------  ---------
                                                                                                
Revenues:
  Software license fees             $   46,508       61.7 %  $   50,552       58.1 % $   81,761       57.4 % $   96,629       55.9 %
  Maintenance fees                      17,204       22.8        15,996       18.4       33,889       23.8       31,563       18.2
  Services                              11,677       15.5        19,309       22.2       26,856       18.8       42,604       24.6
  Hardware, net                              -        0.0         1,094        1.3            -        0.0        2,225        1.3
                                     ----------  ---------    ----------  ---------   ----------   --------    ---------  ---------

              Total revenues            75,389      100.0        86,951      100.0      142,506      100.0      173,021      100.0
                                     ----------  ---------    ----------  ---------   ----------   --------    ---------  ---------

Expenses:

  Cost of software license fees         11,084       14.7         9,950       11.4       21,909       15.4       21,772       12.6
  Cost of maintenance and services      17,264       23.0        18,038       20.7       34,056       23.9       38,331       22.1
  Research and development               9,968       13.2         8,538        9.8       18,428       12.9       16,736        9.7
  Selling and marketing                 18,204       24.1        17,348       20.0       35,765       25.1       33,326       19.2
  General and administrative costs      15,159       20.1        14,976       17.2       29,797       20.9       29,345       17.0
  Amortization of goodwill and
    purchased intangibles                1,758        2.3         1,104        1.4        3,935        2.8        1,548        0.9
                                     ----------  ---------    ----------  ---------    ---------   --------    ---------  ---------

                Total  expenses         73,437       97.4        69,954       80.5      143,890      101.0      141,058       81.5
                                     ----------  ---------    ----------  ---------    ---------   --------    ---------  ---------

Operating income (loss)                  1,952        2.6        16,997       19.5       (1,384)      (1.0)      31,963       18.5
                                     ----------  ---------    ----------  ---------    ---------   --------    ---------  ---------

Other income (expense):
  Interest income                          717        1.0           721        0.8        1,664        1.2        1,424        0.8
  Interest expense                         (72)      (0.1)          (48)      (0.1)        (135)      (0.1)        (159)       0.0
  Transaction related expenses               -        0.0             -        0.0            -        0.0         (653)      (0.4)
  Other                                    (51)      (0.1)          (29)      (0.0)         132        0.1          168        0.1
                                     ----------  ---------    ----------  ---------    ---------  ---------    ---------  ---------

                Total other                594        0.8           644        0.7        1,661        1.2          780        0.5
                                     ----------  ---------    ----------  ---------    ---------  ---------    ---------  ---------

Income before income taxes               2,546        3.4        17,641       20.2          277        0.2       32,743       19.0
Provision for income taxes                (995)      (1.3)       (6,757)      (7.7)        (109)      (0.1)     (12,489)      (7.3)
                                     ----------  ---------    ----------  ---------    ---------   --------    ---------  ---------

Net income                          $    1,551        2.1 %  $   10,884       12.5 %  $     168        0.1 % $   20,254       11.7 %
                                     ==========  =========    ==========  =========    =========   ========    =========   ========


Revenues
Total revenues for the second  quarter of fiscal 2000  decreased  13.3% or $11.6
million  from the  comparable  period in fiscal  1999.  Of this  decrease,  $4.0
million  resulted  from an 8.0% decrease in software  license fee revenue,  $7.6
million  from a 40.0%  decrease in services  revenue,  $1.1  million from a 100%
decrease in hardware  revenue,  offset by a $1.2 million,  or 7.6%,  increase in
maintenance fee revenue.

Total  revenues  for the first  half of  fiscal  2000  decreased  17.6% or $30.5
million from the  comparable  period in fiscal  1999.  Of this  decrease,  $14.9
million  resulted from a 15.4% decrease in software  license fee revenue,  $15.7
million  from a 37%  decrease  in services  revenue,  $2.2  million  from a 100%
decrease in hardware  revenue,  offset by a $2.3 million,  or 7.4%,  increase in
maintenance  fee  revenue.  During the first half of fiscal  2000,  54% of total
revenues  resulted from  international  operations as compared to 52% for all of
fiscal 1999.

During the first quarter of fiscal 2000,  the Company's  large bank and merchant
customers and potential new customers,  in effect,  locked down their systems in
preparation  for the Year  2000.  This Year 2000  lock-down  has had a  negative
impact on the Company's  software  license fee and services  revenue  during the
first half of fiscal 2000 due to the less than expected  demand by the Company's
customers  and  potential  new  customers to upgrade and enhance  their  current
systems. In addition, coming out of the Year 2000 cutover, the Company found its
customers increasingly scrutinizing their information technology purchases which
led to further delays in software and services purchases as compared to activity
in the second quarter of fiscal 1999.

The Company  believes  overall  demand for the  Company's  products and services
appears to be  increasing at a gradual pace,  however,  the Year 2000  lock-down
described above  interrupted the Company's  normal sales cycle and therefore may
have a negative impact on the Company's  revenue and net income beyond the first
half of fiscal  2000.  The  Company  also  believes  customer  demand for system
upgrades and  enhancements  will be slow to return to normal growth  levels,  as
many of the Company's  customers  previously upgraded and enhanced their systems
prior to the Year 2000.

The  statements in this report  regarding  future  results are  preliminary  and
"forward-looking  statements"  within  the  meaning  of the  Private  Securities
Litigation  Reform  Act  of  1995.  In  addition,  this  report  contains  other
forward-looking   statements   including   statements  regarding  the  Company's
expectations,  plans and beliefs. The forward-looking  statements in this report
are subject to a variety of risks and uncertainties. Actual results could differ
materially.  Factors that could cause actual  results to differ  include but are
not limited to those described above and the following:

         -        That  the  Company  will  continue  to  derive  a  substantial
                  majority  of its  total  revenue  from  licensing  its  BASE24
                  family  of  software  products  and  providing   services  and
                  maintenance  related  to  those  products.  Any  reduction  in
                  demand  for,  or  increase  in  competition  with  respect to,
                  BASE24  products  would  have a  material  adverse  effect  on
                  TSA's financial condition and results of operations.

         -        That the  Company's  business is  concentrated  in the banking
                  industry,   making  it  susceptible  to  a  downturn  in  that
                  industry.

         -        Fluctuations  in  quarterly  operating  results  may result in
                  volatility  in TSA's stock price.  No  assurance  can be given
                  that operating results will not vary.

         -        TSA's  stock  price may be  volatile,  in part due to external
                  factors   such  as   announcements   by   third   parties   or
                  competitors,   inherent   volatility  in  the  high-technology
                  sector and changing market conditions in the industry.

For a detailed  discussion of these and other risk factors,  interested  parties
should  review  the  Company's   filings  with  the   Securities   and  Exchange
Commission,  including  Exhibit  99.01 to the  Company's  Annual  Report on Form
10-K for the fiscal year ended September 30, 1999.

Monthly  License Fees (MLF) revenue,  a component of software  license fees, was
$14.2 million and $14.0  million in the second  quarter of fiscal 2000 and 1999,
respectively.  MLF  revenue was $28.9  million  and $26.0  million for the first
half of fiscal  2000 and 1999,  respectively.  The  increase in MLF revenue is a
result of the continued  growth of the installed base of the Company's  consumer
banking, electronic business infrastructure and Internet banking products.

Maintenance  fee  revenue  for the second  quarter  of fiscal  2000 and 1999 was
$17.2  million  and $16.0  million,  respectively.  Maintenance  fee revenue for
the first  half of fiscal  2000 and 1999 was $33.9  million  and $31.6  million,
respectively.  The  increase  in  maintenance  revenue is a result of  continued
growth of the  installed  base of the Company's  consumer  banking and corporate
banking products.

Hardware  revenue  for the  second  quarter  of fiscal  2000 and 1999 was $0 and
$1.1  million,  respectively.  Hardware  revenue  for the  first  half of fiscal
2000 and  1999  was $0 and $2.2  million,  respectively.  The  Company's  market
development  program  with  Compaq  expired on  September  30,  1999 and was not
renewed.

Expenses
Total  operating  expenses for the second  quarter of fiscal 2000 increased 5.0%
or $3.5  million over the  comparable  period in fiscal  1999.  Total  operating
expenses for the first half of fiscal 2000  increased  2.0% or $2.8 million over
the  comparable  period in fiscal 1999.  These  increases  are  primarily due to
the increase in amortization  expense related to the  acquisitions of Insession,
Inc. in March 1999 and SDM  International,  Inc. in July 1999.  This increase is
offset,  in part,  by a reduction  in staff  required  to support the  Company's
products and services.  Total staff  (including  both employees and  independent
contractors) decreased from 2,288 at March 31, 1999 to 2,103 at March 31, 2000

Income Taxes
The  effective  tax rate for the first half of fiscal 2000 was 39.4% as compared
to 37.8% for all of fiscal  1999.  This  increase is primarily  attributable  to
non-deductible  amortization  associated  with the  acquisitions  of  Insession,
Inc. and SDM International, Inc. in 1999.

As of March 31, 2000,  the Company has deferred tax assets of $17.8  million and
deferred tax liabilities of $9.8 million.  Each quarter,  the Company  evaluates
its historical  operating  results as well as its  projections for the future to
determine  the   realizability  of  the  deferred  tax  assets.   This  analysis
indicated  that $8.5  million of the  deferred  tax assets were more likely than
not  to  be  realized.   Accordingly,  the  Company  has  recorded  a  valuation
allowance of $9.3 million as of March 31, 2000.

The  Company  intends to  analyze  the  realizability  of the net  deferred  tax
assets at each future  reporting  period.  Such  analysis may indicate  that the
realization  of various  deferred  tax  benefits  is more  likely  than not and,
therefore, the valuation reserve may be further reduced.

Backlog
As of March 31, 2000 and 1999,  the Company had  non-recurring  revenue  backlog
of $28.2 million and $35.3 million in software license fees,  respectively,  and
$25.8  million  and  $28.9  million  in  services,   respectively.  The  Company
includes in its  non-recurring  revenue  backlog all fees specified in contracts
which have been  executed by the Company  and its  customers  to the extent that
the Company  contemplates  recognition  of the related  revenue within one year.
There can be no assurance that the contracts  included in non-recurring  revenue
backlog  will  actually  generate  the  specified  revenues  or that the  actual
revenues will be generated within the one year period.

As of March 31,  2000 and 1999,  the Company had  recurring  revenue  backlog of
$140 million and $136.8 million,  respectively.  The Company  defines  recurring
revenue  backlog  to  be  all  monthly  license  fees,   maintenance   fees  and
facilities  management  fees specified in contracts  which have been executed by
the  Company  and its  customers  to the extent  that the  Company  contemplates
recognition  of  the  related   revenue  within  one  year.   There  can  be  no
assurance,  however,  that contracts  included in recurring revenue backlog will
actually  generate the  specified  revenues or that the actual  revenues will be
generated within the one year period.

Liquidity and Capital Resources
As of March 31, 2000,  the Company's  principal  sources of liquidity  consisted
of $40.8 million of cash and cash  equivalents,  as compared to $70.5 million at
September 30, 1999.

The  Company's  net cash flows used in operating  activities  for the first half
of fiscal 2000  amounted to $6.4  million.  This compares to $9.6 million in net
cash  flows  provided  by  operating  activities  for the  first  half of fiscal
1999.  The decrease of  $16.1 million  in cash flows from  operating  activities
is  principally  due to lower net income  offset by an increase in  amortization
expense  due to the  acquisitions  of  Insession,  Inc.  in  March  1999 and SDM
International,   Inc.  in  July  1999.  A  contributor  to  the  Company's  cash
management  program is the factoring of accrued  receivables,  whereby  interest
in  Company  receivables  are  transferred  (on a  non-recourse  basis) to third
party  financial  institutions  in exchange  for cash.  During the first half of
fiscal  2000 and 1999,  the  Company  generated  operating  cash  flows from the
factoring  of  accrued   receivables   of  $11.1   million  and  $7.9   million,
respectively.

The  Company's  net  cash  flows  used in  investing  activities  totaled  $13.2
million  and  $12.0  million  in  the  first  half  of  fiscal  2000  and  1999,
respectively.  This  increase is due to growth in  property  and  equipment  and
software  purchases  offset by a decrease  in cash used for  acquisitions.  Cash
used in  investing  activities  in fiscal  2000 of $3.0  million  related to the
Company's  final  payment of the  acquisition  of  Insession,  Inc. in the first
quarter of fiscal 2000.

The  Company's  Board  of  Directors  has  approved  the  repurchase  of  up  to
2,000,000  shares of Common  Stock  through  February  2001.  The purpose of the
stock   repurchase   program  is  to  replace  the  shares  issued  in  the  SDM
acquisition  completed  in July  1999,  and to fund a  reserve  for  shares  for
future employee stock option grants,  acquisitions or other corporate  purposes.
Under this  repurchase  program,  the  Company  purchased  500,300 shares  at an
average  cost of $26.67 for  approximately  $13.3 million  during the first half
of  fiscal  2000.  The  total  number  of  shares   purchased  under  the  stock
repurchase   program   through  March  31,  2000  amounts  to  975,300   shares.
Subsequent  to  March  31,  2000  and  through  May 8,  2000,  the  Company  has
purchased  an  additional  500,000  shares  at an  average  cost of  $15.33  for
approximately  $7.7  million.  The  Company  used  cash  available  to fund  the
Common Stock repurchases.

Management  believes that the Company's  working capital and cash flow generated
from  operations  will be  sufficient  to meet  the  Company's  working  capital
requirements for the foreseeable future.

Corporate Business Strategy
During the second quarter of fiscal 2000,  the Company  announced a new business
strategy  resulting in the formation of six new business units organized  around
the  Company's  products and  services.  Key  elements of the  strategy  include
aligning  the  Company's  business  into  vertically-integrated  business  units
targeted at key market  segments where the Company's  products and services best
match emerging market demand.  The Company believes that its key operating units
will require  capital to create the right  technologies  and solutions and drive
incremental  business.  As a  result  of the  shift  of the  Company's  business
strategy to put an increased  emphasis on new  products  and markets  which have
longer sales and delivery cycles,  the Company expects revenue  recognition will
be pushed out over longer time  periods as compared to revenue  recognition  for
the Company's traditional products.

One of the first steps of this new  business  strategy was the  announcement  of
the  formation  of  Insession   Technologies,   Inc.,  our  electronic  business
infrastructure  business  unit.  As  indicated in the  Company's  April 25, 2000
news  release,  Insession  Technologies,  Inc.  expects  to file a  registration
statement  with the Securities  and Exchange  Commission for a proposed  initial
public  offering  within  the  next  five  months.  The  timing  and size of the
offering are dependent on market  conditions  and other  factors.  This does not
constitute an offer for any securities for sale.

Quantitative and Qualitative Disclosures about Market Risk
There have been no material  changes to the Company's  market risk for the three
and six month  periods  ended March 31, 2000.  See the  Company's  Annual Report
on Form  10-K for the  fiscal  year  ended  September  30,  1999 for  additional
discussion regarding quantitative and qualitative disclosure about market risk.

                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                           PART II. OTHER INFORMATION

Item 1.  Legal Proceedings
On June 14,  1999, HNC Software Inc.  filed a complaint  against the Company and
its  wholly-owned  subsidiary,  ACI Worldwide Inc in the United States  District
Court  for  the  Southern  District  of  California,  San  Diego  Division.  The
complaint   alleged,   among   other   things,   patent   infringement,   unfair
competition,  false  advertising,  and trade libel  relating to ACI  Worldwide's
distribution  of PRISM, a fraud  detection  software  product.  ACI  distributes
PRISM  pursuant to a license  agreement  with  Nestor,  Inc., a company in which
TSA is a  minority  stockholder.  The  complaint  sought  injunctive  relief and
unspecified  damages  including  treble  damages,  costs,  attorneys'  fees  and
various  other forms of relief.  In April 2000,  the Company,  ACI Worldwide and
HNC  mutually  agreed  that  all  claims  in the  San  Diego  lawsuit  would  be
dismissed.  The  District  Court  subsequently  issued an order  dismissing  the
lawsuit with prejudice.

On November 25,  1998,  Nestor had itself filed a complaint in the United States
District Court for the District of Rhode Island  against HNC Software  alleging,
among other  things,  infringement  of a patent  relating to PRISM and antitrust
violations.  HNC Software had filed a  counterclaim  in the Rhode Island lawsuit
alleging  infringement  by Nestor of HNC  Software's  patents  which claims were
essentially  the same as those  filed by HNC  Software  against  the Company and
ACI  Worldwide in the San Diego  lawsuit.  Nestor has since dropped its claim of
patent  infringement  against  HNC in the  Rhode  Island  lawsuit.  Neither  the
Company nor ACI Worldwide is a party to the Rhode Island lawsuit.


Item 4.  Submission of Matters to a Vote of Security Holders
The  Company's  annual  meeting of  stockholders  was held on February 22, 2000.
Each  matter  voted  upon at such  meeting  and the  number of shares  cast for,
against or withheld, and abstained are as follows:

1.   Election of Directors
                                            For             Withheld
     William E. Fisher                      25,630,841      175,047
     David C. Russell                       25,630,341      175,547
     Charles E. Noell, III                  25,630,907      174,981
     Jim D. Kever                           25,627,207      178,681
     Larry G. Fendley                       25,630,241      175,647
     Roger K. Alexander                     25,630,191      175,697

2.   Proposal to approve the  Amendment to the Company's 1999 Stock Option Plan

     For: 20,259,001  Against: 5,464,837  Abstain: 82,050  Broker Non-vote: 0

3.   Ratification  of  Appointment  of Arthur  Andersen  LLP as  Independent
     Auditors for 2000

     For: 25,137,365  Against: 22,479  Abstain: 27,206  Broker Non-vote: 0


Item 6.  Exhibits and Reports on Form 8-K
(a)  Exhibits

     27.00    Financial Data Schedule

(b)  Reports on Form 8-K

     None

SIGNATURES

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

Dated: May 15, 2000


                                       TRANSACTION SYSTEMS ARCHITECTS, INC
                                       (Registrant)


                                        /s/ Edward C. Fuxa
                                        ----------------------------------
                                            Edward C. Fuxa
                                            Controller
                                            (Principal Accounting Officer)

                      TRANSACTION SYSTEMS ARCHITECTS, INC.
                                INDEX TO EXHIBITS


Exhibit
Number                     Description

27.00                      Financial Data Schedule