SUB-SUBLEASE AGREEMENT

     This Sub-Sublease Agreement (the "Agreement") is made as of the 22nd day of
June,  2001  (the  "Effective  Date"),  by and  between  Software  AG,  a  stock
corporation  (Aktiengesellschaft)  organized  under  the  laws  of  the  Federal
Republic of Germany,  having an office at 11190 Sunrise  Valley  Drive,  Reston,
Virginia 20191 (hereafter  referred to as "Software AG"), and Systems Management
Engineering,  Inc. (SMEI), a Virginia  corporation,  having an office at 1100 N.
Glebe Road,  Suite 1010,  Arlington,  Virginia 22201  (hereafter  referred to as
"Systems Management").

                                    RECITALS:

     A.  Pursuant to that certain  Lease,  dated as of June 2, 1998 (the "Master
Lease"), by and between REC Partners, L.P. (hereafter referred to as the "Master
Landlord")  and  Science  Applications   International   Corporation  (hereafter
referred to as the "Master  Tenant"),  Master Landlord leased to Master Tenant a
total of  approximately  161,583  rentable  square feet of space in the building
located at 12100 Sunset Hills Road, Reston, Virginia (the "Building") for a term
expiring on September 30, 2005.


     B.  Pursuant to that  certain  Sublease,  dated as of October 31, 1999 (the
"Sublease"),  Master Tenant sublet to Software AG approximately  17,539 rentable
square feet of space on the third floor of the  Building  (the "Phase I Space"),
and  approximately  831  additional  rentable  square feet of space on the third
floor of the  Building  (the "Phase II  Space"),  totally  approximately  18,370
rentable  square  feet of space  (the  Phase I Space  and the Phase II Space are
collectively referred to herein as the "Sublease Premises").


     C.  Pursuant to that  certain  First  Amendment  to  Sublease,  dated as of
December 3, 1999 (the "First Amendment"),  Master Tenant and Software AG amended
the Sublease, as more particularly described in said First Amendment.


     D.  Systems  Management  wants to sublet from  Software AG a portion of the
Sublease  Premises,  consisting of  approximately  9,342 rentable square feet of
space on the third floor of the Building (the "Subject Premises");  and Software
AG wants to sublet the Subject Premises to Systems Management in accordance with
the terms and conditions of this Agreement.

                                   AGREEMENT:

     NOW,  THEREFORE,  the parties hereto, for themselves,  their successors and
assigns, mutually covenant and agree as follows:


     1. Subject Premises.  Software AG hereby sublets to Systems Management, and
Systems Management hereby sublets from Software AG, the Subject Premises for the
term and  upon the  conditions  hereafter  provided.  The  Subject  Premises  is
depicted in the diagram attached hereto as Exhibit A.


     2.  Specifications.  Software AG is subletting the Subject  Premises in its
"as is"  condition  existing  on the date  possession  is  delivered  to Systems
Management.   Except  as  otherwise   specifically  set  forth  herein,  Systems
Management is subletting the Subject Premises from Software AG without requiring
any alterations,  improvements,  repairs,  or decorations to be made by Software
AG, Master Tenant, or Master Landlord,  or at Software AG's, Master Tenant's, or
Master  Landlord's  expense,  either at the time  possession is given to Systems
Management  or  during  the  entire  term of this  Agreement,  or any  extension
thereof.  In connection  therewith,  Systems  Management  represents that it has
thoroughly  examined the Subject Premises.  Software AG acknowledges that to the
best  of  its  knowledge  the  Subject  Premises  are  in a  structurally  sound
condition,  and the heating,  ventilation,  and air conditioning systems and all
other  mechanical,  electrical and plumbing systems serving the Subject Premises
are in good working order and  condition.  Software AG shall deliver the Subject
Premises to Systems Management in broom-clean condition.

                                  Page 1 of 9


     3. Term.  The term of this  Agreement  shall  commence  upon the earlier of
Systems Management's actual occupancy for its intended use or July 15, 2001 (the
"Commencement Date"), provided that Master Landlord and Master Tenant give their
consents  to the  terms of this  Agreement.  The  Agreement  term  shall  end on
September  30, 2005,  or on such earlier date upon which said term may expire or
be  terminated  pursuant  to any of  the  conditions  or  limitations  or  other
provisions of this Agreement or pursuant to law. In the event Master  Landlord's
or Master  Tenant's  consent has not been obtained  within  forty-five (45) days
after  full  execution  of  this  Agreement  by  both  Software  AG and  Systems
Management,  or such later date as Software AG and Systems  Management may agree
to in writing,  this Agreement  shall be and will become null and void and of no
further force or effect.

     4. Monthly Base Rent. The monthly base rent which Systems Management hereby
agrees to pay to Software  AG in advance,  in equal  monthly  installments,  and
which Software AG hereby agrees to accept,  shall be the sum of Sixteen Thousand
Seven Hundred  Thirty-Seven and 75/100 Dollars  ($16,737.75),  commencing at the
beginning of the term of this Agreement and  continuing  thereafter on the first
day of each and every calendar month during the term of this  Agreement.  If the
obligation  of Systems  Management to pay rent  hereunder  begins on a day other
than on the first day of a calendar  month,  rent from such date until the first
day  of  the  following  calendar  month  shall  be  prorated  at  the  rate  of
one-thirtieth  (1/30th)  of the  monthly  installment  for each day  payable  in
advance.  The monthly base rent,  additional  rent, and any other charges herein
reserved or payable shall be paid to Software AG at its offices as noted in this
Agreement,  to the attention of the Accounts Receivable  Department;  or at such
other  address as Software AG may  designate in writing.  Such amounts  shall be
paid in lawful money of the United States of America without demand therefor and
without any  deduction,  setoff,  or  abatement  whatever,  except as  expressly
provided in this Agreement.

     5. Base Rental Increase.  Upon each  anniversary of the Commencement  Date,
the Monthly Base Rent shall be  increased by three  percent (3%) of the previous
year's Monthly Base Rent payable by Systems Management.

     6. Additional  Rent.  Systems  Management  agrees to pay to Software AG, as
additional  rent under this  Agreement,  its pro rata share of the amount of any
additional  rent  payable by  Software  AG under the  Sublease  pursuant  to the
applicable  sections  of the  Sublease  pertaining  to  real  estate  taxes  and
operating  costs during the calendar  year 2001.  Software AG shall give Systems
Management  copies of all relevant  statements and bills received by it pursuant
to the applicable  provisions of the Sublease,  together with a statement of the
amount of additional  rent, if any, which Systems  Management is required to pay
under this Section.  Systems  Management shall pay additional rent within thirty
(30) days of receipt of this  statement.  Systems  Management  shall also pay to
Software  AG, as  additional  rent,  its pro rata share of all  charges  for any
additional  services  provided  to Systems  Management  by the Master  Landlord,
including, without limitation,  charges and fees for alterations and after-hours
heating and air-conditioning  services.  Systems Management's  obligation to pay
additional  rent shall survive the termination of this Agreement for twelve (12)
months,  but only with  respect to the  period  prior to the  termination  date.
Notwithstanding  anything to the  contrary in this  Agreement  or the  Sublease,
Systems  Management  shall not be obligated to pay any fees or costs  charged by
the  Master  Tenant  for any  penalties,  interest,  or other  costs  related to
Software  AG's  failure to make  timely  payment  of any  amount  owed under the
Sublease.

     7. Security  Deposit.  Systems  Management shall pay to Software AG, on the
Effective Date, a security  deposit in the amount of Thirty-three  Thousand Four
Hundred  Seventy-five and 50/100 Dollars  ($33,475.50) (the "Security Deposit").
If eighteen (18) months after the Commencement  Date, (i) Systems  Management is
not in default  under  this  Agreement,  and had not been in default  under this
Agreement  at any time during the  18-month  period,  and (ii) the  valuation of
Systems Management,  as depicted in its income statement and balance sheet as of
the last day of the 18-month period,  has not materially  decreased from Systems
Management's  valuation as of the Commencement Date, as reasonably determined by
Software AG,  Software AG shall  decrease the amount of the Security  Deposit to
Twenty-five  Thousand  One Hundred Six and 63/100  Dollars  ($25,106.63),  which
amount  Software AG shall retain  during the remaining  term of this  Agreement.
Software AG shall pay to Systems Management  interest on the total amount of the
Security Deposit at an interest rate equal to three percent (3%) per annum; such
interest shall accrue during the entire term of this Agreement.  Software AG may
retain all or any  portion  of the  Security  Deposit in one or more  co-mingled
accounts.

     8. Use. Systems  Management will use and occupy the Subject Premises solely
for general office  purposes and in accordance  with the use permitted under the
applicable  zoning  regulations and the Master Lease.  Without the prior written
consent of the Master Tenant and Software AG, which consent of Software AG shall
not be  unreasonably  withheld,  the Subject  Premises  will not be used for any
other purposes.

                                  Page 2 of 9

     9. Alterations.


     9.1  Excepting for cosmetic or decorative  alterations  and any  provisions
herein  to the  contrary,  Systems  Management  shall  not make any  alteration,
improvement,  or installation  (hereinafter  called  "Alterations") in or to the
Subject Premises,  without in each instance  obtaining the prior written consent
of the Master  Tenant and Software AG, which consent of Software AG shall not be
unreasonably  withheld.  If any Alterations are made without consent, the Master
Tenant or Software AG may require Systems Management to remove the same, and may
require Systems Management to correct,  repair, and restore the Subject Premises
and any damage arising from such removal, and Systems Management shall be liable
for any and all direct and incremental costs and expenses incurred by the Master
Tenant or Software AG in the performance of this work.


     9.2 Systems Management may have Alterations performed by contractors of its
own choice,  at its  expense,  provided  that  Systems  Management  has obtained
written  approval of the  contractor by the Master  Landlord,  Master Tenant and
Software AG, which  consent of Software AG shall not be  unreasonably  withheld.
Software  AG's  approval  of an  Alteration  shall  be  based  upon  the  proper
licensing,  financial  posture,  experience,  and  past job  performance  of the
contractor. The design of all Alterations undertaken by Systems Management shall
be subject to prior written approval of the Master  Landlord,  Master Tenant and
Software AG, which  consent of Software AG shall not be  unreasonably  withheld;
such design shall not commence until such approval is obtained.  With reasonable
prior notice to Systems Management,  the Master Landlord, the Master Tenant, and
Software  AG,  shall at all  times  have the  right to  inspect,  during  normal
business  hours,  the work  performed  by any  contractor  selected  by  Systems
Management.


     9.3 Systems  Management shall have no obligation to restore any Alterations
within  the  Subject  Premises  to  the   configuration   that  existed  at  the
commencement of the Agreement,  unless the  requirement for such  restoration is
specifically  stated at the time of Software AG's  approval.  If, within fifteen
(15) business days after written notice,  Systems Management fails or refuses to
remove such Alterations,  or fails to correct,  repair,  and restore the Subject
Premises,  Software  AG may  cause  the  same to be  removed,  and  repairs  and
restoration to be made, in which event,  Systems  Management shall reimburse the
party that caused said  Alterations to be removed and repairs to be made for the
cost of such  removal,  repairs,  and  restoration,  together  with  any and all
damages that such party, the Master Landlord,  the Master Tenant, or Software AG
may suffer and sustain by reason of Systems  Management's  failure or refusal to
remove said Alterations.


     10. Systems Management's Personal Property. All furnishings, equipment, and
fixtures, excluding leasehold improvements, which are paid for and placed within
the Subject  Premises by Systems  Management  from time to time shall remain the
property of Systems  Management.  Upon the expiration or earlier  termination of
this  Agreement,   Systems   Management  shall  remove  all  of  its  furniture,
furnishings,  and equipment, shall repair all damage resulting from such removal
or its use of the Subject Premises, and shall surrender the Subject Premises, as
so required, in good condition,  subject only to reasonable wear and tear and to
damage, if any, by fire or other casualty. The obligations of Systems Management
as herein  provided  shall expire  thirty (30) days after  expiration or earlier
termination of this Agreement.


     11. Terms of the Master Lease and the Sublease.


     11.1 All of the terms, provisions,  covenants, and conditions of the Master
Lease and the Sublease are  incorporated  herein by reference  and hereby made a
part of and are superior to this Agreement, except as herein otherwise expressly
provided.

     11.2 Systems Management shall be obligated,  however,  to pay only the rent
and  additional  rent  provided for under this  Agreement and not the amounts of
rent and rental  escalations  provided  under the Master Lease and the Sublease.
Systems  Management  hereby assumes all of the  obligations of Software AG under
the  Sublease,  but  only to the  extent  they  are  applicable  to the  Subject
Premises.  Systems  Management shall obtain and maintain all insurance types and
coverages as specified in the Sublease to be obtained and maintained by Software
AG, in amounts not less than those  specified in the  Sublease.  All policies of

                                  Page 3 of 9

insurance obtained by Systems Management shall name the Master Tenant, including
its agents,  and Software AG as additional  insureds  thereon in accordance with
the Sublease.  Systems  Management's  insurance shall be primary over the Master
Tenant's  insurance,  including it agents, and Software AG's insurance.  Systems
Management will deliver to Software AG and Master Tenant certificates  verifying
that Systems Management has obtained and is maintaining, at a minimum, insurance
coverage in the amount of $2 million,  for general  liability  coverage,  and $1
million per  occurrence and providing for thirty (30) days notice to Software AG
and Master Tenant of any cancellation or non-renewal.


     11.3  Notwithstanding  anything in this Agreement to the contrary,  Systems
Management agrees that Software AG shall not be obligated to furnish for Systems
Management any services of any nature whatsoever, including, without limitation,
the furnishing of heat,  electrical energy, air conditioning,  elevator service,
cleaning,  window washing,  or rubbish removal  services.  Software AG, however,
shall be obligated to take all action necessary to obtain the performance of and
furnishing of such services for the Subject  Premises by the Master Landlord and
the Master  Tenant  pursuant to the terms of the Master Lease and the  Sublease,
respectively.


     11.4  Software AG shall have all of the rights of the Master  Tenant  under
the Sublease as against  Systems  Management and, as between the parties hereto,
Software AG agrees to observe and perform the terms, covenants and conditions on
its part to be observed  and  performed  hereunder  as well as those  applicable
terms,  covenants  and  conditions  to be observed  and  performed by the Master
Tenant under the Sublease in respect of the Subject Premises. Systems Management
acknowledges  that it has  received  a true  copy of the  Sublease,  that it has
reviewed the Sublease, and that it is familiar with the contents thereof.


     11.5  If  the  Sublease  is  terminated  pursuant  to  its  provisions,  or
otherwise,  Software AG agrees that this Agreement, at the consent of the Master
Tenant,  which consent may be given, denied or withheld by the Master Tenant, in
its sole and absolute  discretion,  may immediately become a prime sublease with
all of the rights,  privileges and  obligations  therein  transferred to Systems
Management.


     12. Systems Management's Covenants. Systems Management covenants and agrees
that Systems  Management  will not do anything which would  constitute a default
under the Master  Lease or the  Sublease  or omit to do anything  which  Systems
Management is obligated to do under the terms of this  Agreement and which would
constitute a default under the Master Lease or the sublease.


     13. Indemnification.


     13.1 Systems Management shall and hereby does indemnify and hold the Master
Landlord and the Master Tenant,  including their respective agents, and Software
AG harmless  from and against any and all  actions,  claims,  demands,  damages,
liabilities and expenses (including,  without limitation,  reasonable attorneys'
fees) asserted against, imposed upon, or incurred by the Master Landlord, Master
Tenant or  Software  AG by  reason  of (i) any  violation  caused,  suffered  or
permitted by Systems Management, its agents, servants, employees or invitees, of
any of the terms, covenants or conditions of the Agreement,  and (ii) any damage
or injury to persons or property occurring upon or in connection with the use or
occupancy of the Subject  Premises,  except as a result of the acts or omissions
of Software AG, or the Master  Landlord or the Master  Tenant,  including  their
respective agents, employees or invitees.


     13.2  Software  AG  shall  and  hereby  does  indemnify  and  hold  Systems
Management  harmless  from and against  any and all  actions,  claims,  demands,
damages,  liabilities and expenses  (including,  without limitation,  reasonable
attorneys' fees) asserted against, imposed upon or incurred by reason of (i) any
violation  caused,  suffered or permitted by Software AG, its agents,  servants,
employees  or invitees,  of any of the terms,  covenants  or  conditions  of the
Agreement,  and (ii) any damage or injury to persons or property  occurring upon
or in connection with the use or occupancy of the Subject Premises,  except as a
result of the acts or omissions of Systems Management,  or its agents, employees
or invitees.


     14. Assignment and Agreement.  (a) Systems Management agrees not to assign,
mortgage, pledge or otherwise encumber this Agreement, nor to sublet the Subject
Premises  or any part  thereof,  without in each  instance  obtaining  the prior
written  consent of the Master  Landlord,  Master  Tenant and Software AG, which
consent of Software AG shall not be unreasonably withheld.

                                  Page 4 of 9

     (b) In the event that  Systems  Management  desires  to sublet the  Subject
Premises or assign the  Agreement,  Systems  Management  shall give Software AG,
Master  Landlord and the Master Tenant  written  notice of Systems  Management's
intended  subtenant  or  assignee  in order to secure  the Master  Tenant's  and
Software  AG's  written  consent.  Within  twenty  (20) days of  receipt of said
notice,  Software AG shall have the right:  (i) to terminate  this  Agreement by
giving Systems Management not less than thirty (30) days' notice (or one hundred
twenty (120) days' notice if space is being  utilized by Systems  Management) in
the case of an assignment  of the entire  Agreement or a subletting of more than
fifty percent (50%) of the Subject Premises; or (ii) to terminate this Agreement
and  simultaneously  enter into a new sub-sublease  with Systems  Management for
that  portion of the Subject  Premises  that  Systems  Management  may desire to
retain upon the same terms,  covenants and conditions of the existing  Agreement
as applicable to the space  retained.  The Master Landlord and the Master Tenant
shall  have all  rights  provided  in the  Master  Lease  and the  Sublease,  as
applicable, for any further subletting of any portion of the Subject Premises or
any assignment of this Agreement.


     (c) In the event  Software AG does not exercise its right to terminate this
Agreement,  and  Software AG and the Master  Tenant have granted  their  written
consents,  Systems  Management  may  sublet  all or a  portion  of  the  Subject
Premises.  Fifty percent (50%) of any profit amounts (i.e., rental receipts less
customary  transaction costs, such as tenant improvements,  attorneys' fees, and
broker fees) above the Monthly Base Rent  accruing to Systems  Management as the
result of such sub-sublease  shall be paid by Systems  Management to Software AG
monthly as additional rent.


     (d) In the event of any subletting of the Subject Premises or assignment of
this  Agreement by Systems  Management,  with or without  Software AG's consent,
Systems  Management  shall remain liable to the Master Tenant for payment of the
rent stipulated herein and all other covenants and conditions contained herein.


     15.  Parking.  During the term of this  Agreement,  Software  AG shall make
available  to Systems  Management  a pro-rata  share of the parking  spaces made
available  to  Software  AG  under  Section  5.08  (entitled  "Parking")  of the
Sublease.


     16. Defaults.


     16.1  Without  limiting  the  other  provisions  of  this  Agreement,   the
occurrence of any of the following shall  constitute an "event of default" under
this  Agreement:  (i) any rent is not paid for a period of fifteen  (15) or more
days from and including the due date; or (ii) Systems  Management  shall fail to
comply with any term, provision,  condition, or covenant of the Sublease or this
Agreement,  other than the payment of rent,  and shall fail to cure such failure
within  fifteen (15) days after  receipt of written  notice from  Software AG of
such default,  unless such default cannot reasonably be cured within said 15-day
period, and Systems Management is diligently pursuing a cure of said default; or
(iii) any petition is filed by or against Systems  Management  under any section
or chapter of the National  Bankruptcy Act, as amended from time to time, or any
successor statute thereto;  or (iv) Systems Management shall become insolvent or
make a transfer in fraud of creditors;  or (v) Systems  Management shall make an
assignment  for the benefit of creditors;  or (vi) a receiver is appointed for a
substantial  part of the assets of Systems  Management;  or (vii) the  leasehold
estate of Systems Management, or any part thereof, is levied under an execution.

     16.2 Upon the occurrence of any event of default, in addition to and not in
limitation  of any other right or remedy  available  to Software AG at law or in
equity,  Software  AG shall  have the  option  at any time  thereafter  to:  (i)
terminate this  Agreement  within fifteen (15) business days' notice sent to the
last known address of Systems Management;  or (ii) re-enter the Subject Premises
by the manner  prescribed by any statute  relating to summary process and remove
all property therefrom,  but Systems Management shall remain liable for the base
rent and additional rent  pertaining to the Subject  Premises for the balance of
the term. Software AG shall mitigate any damages caused by Systems  Management's
default in accordance with applicable laws.

     16.3 In the event Systems Management vacates the Subject Premises,  Systems
Management  shall leave keys to the Subject Premises with Software AG's agent or
representative  on site,  so that Software AG may have  immediate  access to the
Subject Premises. It is agreed and understood that such a delivery of keys shall

                                  Page 5 of 9

not be deemed a termination of the Agreement.  All the rights and remedies given
to Software AG shall be deemed  cumulative  and the election of one shall not be
deemed a waiver of any other or further rights or remedies.

     17. Brokers.  Systems Management hereby represents and warrants that it has
not dealt with any broker  other than Irving  Group and Larsen  Commercial  Real
Estate Services,  Inc. (acting as agent for Software AG) in connection with this
Agreement.

     18.  Entire  Agreement.  This  Agreement  contains  all of  the  covenants,
agreements,  terms,  provisions,   conditions,   warranties  and  understandings
relating to the  subletting  of the Subject  Premises  and Systems  Management's
obligations in connection  therewith,  and neither  Software AG nor any agent or
representative of Software AG has made or is making,  and Systems  Management in
executing and delivering  this  Agreement is not relying upon,  any  warranties,
representations,  promises  or  statements  whatsoever,  except  to  the  extent
expressly set forth in this Agreement.  All  understandings  and agreements,  if
any,  heretofore  had between  Software AG and Systems  Management are merged in
this Agreement,  which alone fully and completely expresses the agreement of the
parties.  The failure of Software AG to insist in any  instance  upon the strict
keeping,  observance or performance of any covenant,  agreement, term, provision
or condition of this  Agreement  or to exercise  any election  herein  contained
shall not be  construed  as a waiver or  relinquishment  for the  future of such
covenant, agreement, term, provision,  condition or election, but the same shall
continue and remain in full force and effect.  No waiver or  modification of any
covenant,  agreement,  term,  provision or condition of this Agreement  shall be
deemed to have been made  unless  expressed  in writing and signed by the Master
Tenant and Software AG. No surrender of possession of the Subject Premises or of
any part thereof or of any remainder of the term of this Agreement shall release
Systems  Management  from any of its  obligations  hereunder  unless accepted by
Software AG in writing. The receipt and retention by Software AG of monthly base
rent or additional rent from anyone other than Systems  Management  shall not be
deemed a waiver of the breach by Systems Management of any covenant,  agreement,
term or provision of this  Agreement,  or as the acceptance of such other person
as a tenant,  or as a release of Systems  Management  from the further  keeping,
observance or  performance by Systems  Management of the covenants,  agreements,
terms, provisions and conditions herein contained.  The receipt and retention by
Software AG of monthly base rent or additional rent with knowledge of the breach
of any covenant,  agreement, term, provision or condition herein contained shall
not be deemed a waiver of such breach.

     19.  Successors and Assigns.  The  obligations of this Agreement shall bind
and benefit the  successors  and permitted  assigns of the parties with the same
effect  as if  mentioned  in each  instance  where a party  hereto  is  named or
referred to.

     20. Notices.  Any and all communications  delivered hereunder shall be sent
by  first-class  mail:  if to Software AG, 11190 Sunrise  Valley Drive,  Reston,
Virginia 20191, Attention: Contracts Administrator, and if to Systems Management
at 12100 Sunset Hills Road, Reston, Virginia 20190, Attention:  Ellwood H. Witt,
Jr., or to such other address and attention as any of the above shall notify the
others in writing.

     21.  Incorporation  of Recitals.  The Recitals of this Agreement are hereby
incorporated into, and made a part of, the terms of this Agreement.

     22.  Master  Tenant's  Consent.  This  Agreement  shall be  effective  upon
obtaining the written consent of the Master Tenant and it is hereby acknowledged
by Software AG and Systems  Management that the Master Tenant's  consent to this
Agreement (i) shall not make the Master Tenant, including its agents, a party to
this Agreement,  (ii) shall not create any contractual  liability or duty on the
part of the Master Tenant, including its agents, to the Systems Management,  and
(iii) shall not in any manner increase, decrease, or otherwise affect the rights
and obligations of the Master Tenant and Software AG, as the Subtenant under the
Sublease, in respect of the Subject Premises.

     23. Other Provisions.  Notwithstanding  anything written to the contrary in
this Agreement, Systems Management and Software AG hereby agree to the following
additional  terms in connection  with  Software  AG's  subletting of the Subject
Premises to Systems Management:

                                  Page 6 of 9

     23.1 Tenant Improvements/Alterations. (a) Notwithstanding Section 9 hereof,
Software AG, at no additional  cost to Systems  Management,  Master  Tenant,  or
Master  Landlord,  shall  make  the  following  improvements/alterations  to the
Subject Premises,  subject to the prior written consent of the Master Tenant and
the Master Landlord, as applicable:

     o    Electronic  security  access system:  The card readers shall remain in
          the current locations, but the main alarm system and the alarm service
          will not be included in this Agreement.

     o    The  refrigerator  on the  north  side  of the  Subject  Premises,  as
          delineated  by the  Building  common  corridor,  shall  remain  in the
          current location; the refrigerator on the south side shall be removed.
          To the best  knowledge  of Software  AG, the  refrigerator  is in good
          working  condition  as of the date  Systems  Management  occupies  the
          Subject Premises.

     o    The  extra  HVAC in the  server  room  on  north  side of the  Subject
          Premises, as delineated by the Building common corridor,  shall remain
          in the current  location.  To the best  knowledge  of Software AG, the
          extra  HVAC  is in  good  working  condition  as of the  date  Systems
          Management occupies the Subject Premises.

     o    Software AG shall construct a demising  partition between the existing
          main reception area and the immediate  adjacent  office to the west of
          this main reception area. This wall shall be a slab-to-slab wall. This
          work shall be  performed  either  prior to  occupancy  of the  Subject
          Premises  by  Systems  Management  or within  thirty  (30) days  after
          occupancy,  depending  on  permits,  approvals,  plans,  and any other
          issues related to the  construction  of the demising  partition.  This
          work shall be performed during normal business hours.


     (b)  Systems   Management   shall  be  authorized  to  make  the  following
improvements/alterations to the Subject Premises, at its own expense, subject to
the prior  written  consent of the Master  Tenant  and the Master  Landlord,  as
applicable:

     o    Install glass suite entry doors.

     o    Remove partitions in three (3) interior offices.

     o    Re-configure the conference room.

     o    A directory listing in each lobby of the Building.

     (c) Systems  Management and/or Software AG shall provide Master Tenant with
a copy of as-built drawings for any construction done in the Premises.

     23.2 Racks and Hubs.  The existing  racks and patch panels  within both the
server  room and the  telephone  closet  may be sold to  Systems  Management  at
replacement  cost, as determined by Software AG. If Systems  Management does not
agree with the  price,  it shall not be  obligated  to  purchase  such racks and
panels.

     23.3  Telecommunications.  Systems  Management shall be responsible for the
costs of separating  the telephone  wiring and LAN cabling for its space and all
new cabling and hook-up costs.  All existing data and telephone  cabling will be
provided to Systems  Management in its "as-is"  condition.  Software AG will not
cut the cables upon vacating the Subject  Premises,  but shall  disconnect  such
cables as it deems necessary or appropriate.

     23.4 Phone Closet Access.  Systems Management shall give other occupants of
the third  (3rd) floor of the  Building  shared,  scheduled  access to the phone
closet, which resides in the Subject Premises. This closet will be available for
use by other subtenants of Software AG (whether  currently  existing or existing
in the future), and any other occupant of office space on the third floor.

                                  Page 7 of 9

     23.5 Signage. If desired by Systems Management,  Systems Management may, at
its sole cost,  install an exterior  sign on the wall  adjacent to its main hall
doorway,  provided  that such sign is installed in  conformance  with the Master
Landlord's  building  signage  policy.  Software AG will conform with the Master
Landlord's  standards for such signage and will seek Master Landlord's  approval
as part of the formal consent process.

     23.6 Quiet Enjoyment.  Systems Management shall have quiet enjoyment of the
Subject Premises under the terms and conditions of this Agreement.

     23.7 Early  Access to  Subject  Premises.  Software  AG shall have the sole
discretion to grant Systems Management and its designated  contractors access to
the Subject  Premises  prior to the  Commencement  Date to set-up voice and data
communications apparatuses. In the event that Software AG consents to such early
access,  Systems  Management  must be  escorted  through the  Building  and must
perform the work during the Building's normal business hours.

     24.  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
counterparts,  each of  which  shall  be  deemed  an  original  but all of which
together shall constitute one and the same instrument.


                     [AGREEMENT CONTINUED ON FOLLOWING PAGE]

                                  Page 8 of 9






     IN WITNESS WHEREOF,  Software AG and Systems  Management have duly executed
this Agreement as of the day and year first above written.

Attest:                                                      Software AG


By: _________________________               By: ________________________________

                                            Printed Name: ______________________

                                            Title:______________________________

                                            Date: ______________________________



Attest:                                     Systems Management Engineering, Inc.


By: _________________________               By: ________________________________
                                                Herbert B. Quinn, Jr.
                                                Chief Executive Officer

                                            Date: ______________________________



                                  Page 9 of 9