SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                                (Amendment No. 6)


                        Integrated Security Systmes, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    45812J101
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                Russell Cleveland
                         Renaissance Capital Group, Inc.
                  8080 N. Central Expressway, Suite 210, LB-59
                            Dallas, Texas 75206-1847
                                 (214) 891-8294
--------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                February 20, 2002
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of This Statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
report the  acquisition  that is the subject of this Schedule 13D, and is filing
this  schedule  because  of Rule  13d-1(e),  13d-1(f)  or  13d-1(g),  check  the
following box [_].


                         (Continued on following pages)
                               (Page 1 of 7 Pages)







CUSIP No.45812J101                     13D                    Page 2  of 7 Pages


________________________________________________________________________________
1    NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
     Renaissance Capital Growth & Income Fund III, Inc.               75-2533518


________________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3    SEC USE ONLY



________________________________________________________________________________
4    SOURCE OF FUNDS*

     WC

________________________________________________________________________________
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]



________________________________________________________________________________
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     Texas

________________________________________________________________________________
               7    SOLE VOTING POWER

  NUMBER OF
                    23,727,630
   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER
BENEFICIALLY
                    None
  OWNED BY
               _________________________________________________________________
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING         23,727,630

   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER
    WITH
                    None

________________________________________________________________________________
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


     23,727,630
________________________________________________________________________________
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [_]

________________________________________________________________________________
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     68.89%

________________________________________________________________________________
14   TYPE OF REPORTING PERSON*


     IV
________________________________________________________________________________




CUSIP No.45812J101                     13D                   Page 3  of 7  Pages


________________________________________________________________________________
1    NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)


     Renaissance US Growth and Income Trust PLC                   None - Foreign
________________________________________________________________________________
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3    SEC USE ONLY



________________________________________________________________________________
4    SOURCE OF FUNDS*


     WC
________________________________________________________________________________
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   [_]



________________________________________________________________________________
6    CITIZENSHIP OR PLACE OF ORGANIZATION


     England
________________________________________________________________________________
               7    SOLE VOTING POWER

  NUMBER OF
                    22,891,318
   SHARES      _________________________________________________________________
               8    SHARED VOTING POWER
BENEFICIALLY

  OWNED BY          None
               _________________________________________________________________
    EACH       9    SOLE DISPOSITIVE POWER

  REPORTING
                    22,891,318
   PERSON      _________________________________________________________________
               10   SHARED DISPOSITIVE POWER
    WITH

                    None
________________________________________________________________________________
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


     22,891,318
________________________________________________________________________________
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [_]

________________________________________________________________________________
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)


     68.11%
________________________________________________________________________________
14   TYPE OF REPORTING PERSON*


     IV
________________________________________________________________________________



CUSIP No.45812J101                     13D                   Page 4  of 7  Pages


________________________________________________________________________________
Item 1.  Security and Issuer.

     This statement  relates to the Common Stock ("Common Shares") of Integrated
Security Systems,  Inc. (the "Company").  The principal executive offices of the
Company are located at 8200 Springwood Drive, Irving, Texas 75063.

________________________________________________________________________________
Item 2.  Identity and Background.

     (a) This  Statement is filed by  Renaissance  Capital  Growth & Income Fund
III, Inc.  ("Renaissance  III"),  and  Renaissance  US Growth & Income Trust PLC
("Renaissance  PLC");  Renaissance III and Renaissance  PLC,  collectively  (the
"Reporting Persons").

     (b) Renaissance III is a business  development  company regulated under the
Investment Company Act of 1940, as amended,  and organized under the laws of the
State of Texas,  with its  principal  business and  principal  office at 8080 N.
Central Expressway, Suite 210, LB-59, Dallas, Texas 75206-1857.

     Renaissance PLC is an investment  trust organized under the laws of England
and Wales.  Its address in the United States is c/o  Renaissance  Capital Group,
Inc., Investment Manager, 8080 N. Central Expressway,  Suite 210, LB-59, Dallas,
Texas 75206-1857.

     The  business  addresses of the  directors  and  executive  officers of the
Reporting  Persons  are  set  forth  on  Attachment  1  to  this  Statement  and
incorporated herein by reference.

     (c)  Renaissance  III and  Renaissance  PLC are engaged in the  business of
investing principally in emerging or undervalued U.S. public companies.

     (d) Neither any of the Reporting Persons nor, to the best knowledge of such
persons, any person named in Attachment 1 to this Statement,  has been convicted
in a criminal proceeding in the past five years (excluding traffic violations or
similar misdemeanors).

     (e) Neither any of the Reporting Persons nor, to the best knowledge of such
persons, any person named in Attachment 1 to this Statement, was during the last
five years a party to a civil proceeding of a judicial or administrative body of
competent  jurisdiction  as a result of which such person was or is subject to a
judgment,  decree, or final order enjoining future violations of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

     (f) All persons named on Attachment 1 to this Statement are citizens of the
United  States  or the  United  Kingdom,  unless  otherwise  indicated  on  such
Attachment.
________________________________________________________________________________
Item 3.  Source and Amount of Funds or Other Consideration.

    The total  amount of funds  required  by  Renaissance  III to  acquire  the
securities  reported in Item 5(a) was  $4,839,240.  The source of such funds was
capital of Renaissance III.

     The total  amount of funds  required  by  Renaissance  PLC to  acquire  the
securities  reported in Item 5(a) was  $4,673,114.  The source of such funds was
capital of Renaissance PLC.

CUSIP No.45812J101                     13D                   Page 5  of 7  Pages
________________________________________________________________________________
Item 4.  Purpose of Transaction.

     The  Reporting  Persons each  acquired  beneficial  ownership of the Common
Stock  reported  in Item  5(a)  both in the  ordinary  course  of  business  for
investment  purposes and upon exchange of  indebtedness  in connection  with the
financial  restructuring  of the Company.  The President and CEO of  Renaissance
Capital  Group,  Inc.,  the  investment  advisor  to  Renaissance  III  and  the
investment manager of Renaissance PLC, Russell Cleveland,  has been appointed to
the board of directors of the Company.

     The Reporting  Persons may  participate in discussions  with  management or
third parties in which the Reporting  Person may suggest or take a position with
respect to potential changes in the operations, management, or capital structure
of such companies as a means of enhancing shareholder value. Such suggestions or
positions may relate to one or more of the transactions specified in clauses (a)
through (j) of Item 4 of the Schedule 13D form,  including,  without limitation,
such  matters as  disposing  of one or more  businesses,  selling  the  Company,
merging with another Company or acquiring another company or business,  changing
operating  or marketing  strategies,  changes in  management  or  marketing,  or
restructuring the Company's capitalization.

     Each Reporting Person continues to assess the Company's business, financial
condition, results of operations and prospects, general economic conditions, the
securities  markets  in  general  and  those  for the  Company's  securities  in
particular,  other developments and other investment  opportunities,  as well as
the Reporting Person's investment objectives. Depending on such assessments, one
or both of the  Reporting  Persons  may  acquire  additional  securities  or may
determine  to sell  or  otherwise  dispose  of  some  or all of its  holding  of
securities.

     Other than as described  above,  neither of the  Reporting  Persons has any
present plans or proposals  which relate to or would result in any  transaction,
change,  or event specified in clauses (a) through (j) of Item 4 of the Schedule
13D.

________________________________________________________________________________
Item 5.  Interest in Securities of the Issuer.

     (a) Renaissance  III  beneficially  owns  23,727,630  Common  Shares,  and
Renaissance  PLC  beneficially  owns  22,891,318  Common  Shares.  The Reporting
Persons  beneficially own 46,618,948  Common Shares.  Based upon information the
11,143,071  shares of the Company's stock outstanding as of January 31, 2002, as
filed with the Securities  and Exchange  Commission in the Company's most recent
Form 10-Q SB for the quarter ended December 31, 2001, and using SEC  computation
rules, the Common Shares beneficially owned by Renaissance III, Renaissance PLC,
and  together represent  approximately 68.89%, 68.11%, and 80.71%, respectively,
of the outstanding Common Stock of the Company.  Renaissance III and Renaissance
PLC disclaim that they are members of a group for purposes of Regulation 13D.

     The Common Shares  beneficially  owned by Renaissance  III are comprised of
426,131 shares of Common Stock;  2,064,299  shares of Common Stock issuable upon
the  exercise of warrants;  187,500  shares of Common  Stock  issuable  upon the
conversion  of 7,500  shares of Series D Preferred  Stock;  2,714,945  shares of
Common Stock  issuable upon  conversion of 21,720 shares of Series F Convertible
Preferred Stock ("Series F Preferred  Stock");  and 18,334,755  shares of Common
Stock  issuable  upon  conversion  of  146,678  shares of  Series G  Convertible
Preferred  Stock  ("Series  G  Preferred  Stock").  The  board of  directors  of
Renaissance III exercises  voting and investment  control over the securities of
the Company owned by it.

     Renaissance PLC is deemed the beneficial  owner of Common Shares  comprised
of 426,131  shares of Common Stock;  2,058,617  shares of Common Stock  issuable
upon the exercise of warrants;  187,500 shares of Common Stock issuable upon the
conversion  of 7,500  shares of Series D Preferred  Stock;  2,714,945  shares of
Common Stock  issuable  upon  conversion  of 21,720 shares of Series F Preferred
Stock; and 17,504,125 shares of Common Stock issuable upon conversion of 140,033
shares of Series G Preferred  Stock.  The board of directors of Renaissance  PLC
exercises voting and investment control over the securities of the Company owned
by it.

CUSIP No.45812J101                     13D                   Page 6  of 7  Pages

     (b) Number of shares as to which Renaissance III has:
         (i)    Sole power to vote or to direct the vote
                23,727,630
         (ii)   Shared power to vote or to direct the vote
                None
         (iii)  Sole power to dispose or to direct the disposition of
                23,727,630
         (iv)   Shared power to dispose or to direct the disposition of
                None

         Number of shares as to which Renaissance PLC has:
         (i)    Sole power to vote or to direct the vote
                22,891,318
         (ii)   Shared power to vote or to direct the vote
                None
         (iii)  Sole power to dispose or to direct the disposition of
                22,891,318
         (iv)   Shared power to dispose or to direct the disposition of
                None

     (c) No transaction in the Common Shares was effected by a Reporting  Person
during the past 60 days,  except as follows:  (1) the  purchase on December  27,
2001, of a $25,000  non-convertible,  8%, 120 day promissory  note and five-year
warrants to  purchase  125,000  shares of Common  Stock at $0.20 a share by each
Renaissance III and Renaissance  PLC; (2) the purchase on January 14, 2002, of a
$50,000  non-convertible,  8%, 120 day promissory note and five-year warrants to
purchase 250,000 shares of Common Stock at $0.20 a share by each Renaissance III
and  Renaissance  PLC; the receipt on February 1, 2002, by each  Renaissance III
and  Renaissance  PLC of 10, 634 shares of Common  Stock as payment in kind of a
$3,402.74 dividend on the Company's Series D Preferred stock; and the receipt on
February 20, 2002, by each  Renaissance  III and  Renaissance  PLC of a total of
8,775  shares of Common  Stock as  payment  in kind of a total of  $2,882.19  in
interest due on promissory notes.

     (d) No person other than the Reporting  Persons has the right to receive or
the power to direct the receipt of dividends from, or the proceeds from the sale
of, the Common Shares beneficially owned by the Reporting Persons.

     (e) Not applicable.
________________________________________________________________________________
Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
         to Securities of the Issuer.

         Not Applicable.

________________________________________________________________________________
Item 7.  Material to be Filed as Exhibits.

     Exhibit 1   Joint Filing Agreement Pursuant to Rule 13d-1(k)

                            [Signature page follows]


________________________________________________________________________________


CUSIP No.45812J101                     13D                   Page 7  of 7  Pages

                                   SIGNATURE


     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

     The persons  whose  signatures  appear  below agree that this  statement on
Schedule 13D is filed on behalf of each of them.



                                                     March 7, 2002
                                                         (Date)


                              Renaissance Capital Growth & Income Fund III, Inc.


                                        ________________________________________
                                        (Signature)

                                        Russell Cleveland
                                        President and Chief Executive Officer
                                        (Name/Title)


                              Renaissance US Growth and Income Trust PLC



                                        ________________________________________
                                        (Signature)

                                        Russell Cleveland
                                        Director
                                        (Name/Title)


Attention.  Intentional  misstatements  or omissions of fact constitute  federal
criminal violations (see 18 U.S.C. 1001).

                                  ATTACHMENT 1

     The name, business address,  and principal  occupation of the directors and
executive officers of Renaissance III are as follows:

DIRECTORS
                                                                     Principal
Name                      Business Address                           Occupation

Edward O. Boshell, Jr.    c/o Renaissance Capital Group, Inc.        Director
                          8080 North Central Expressway
                          Suite 210, LB-59
                          Dallas, TX 75206-1857
Russell Cleveland         c/o Renaissance Capital Group, Inc.        Director
                          8080 North Central Expressway
                          Suite 210, LB-59
                          Dallas, TX 75206-1857
Peter Collins             c/o Renaissance Capital Group, Inc.        Director
                          8080 North Central Expressway
                          Suite 210, LB-59
                          Dallas, TX 75206-1857
Ernest C. Hill            c/o Renaissance Capital Group, Inc.        Director
                          8080 North Central Expressway
                          Suite 210, LB-59
                          Dallas, TX 75206-1857
OFFICERS

Russell Cleveland         c/o Renaissance Capital Group, Inc.    President and
                          8080 North Central Expressway          Chief Executive
                          Suite 210, LB-59                       Officer
                          Dallas, TX 75206-1857
John A. Schmit            c/o Renaissance Capital Group, Inc.    Vice President
                          8080 North Central Expressway
                          Suite 210, LB-59
                          Dallas, TX 75206-1857
Robert C. Pearson         c/o Renaissance Capital Group, Inc.    Vice President
                          8080 North Central Expressway
                          Suite 210, LB-59
                          Dallas, TX 75206-1857
Barbara A. Butschek       c/o Renaissance Capital Group, Inc.    Secretary and
                          8080 North Central Expressway          Treasurer
                          Suite 210, LB-59
                          Dallas, TX 75206-1857







     The name, business address,  and principal  occupation of the directors and
executive officers of Renaissance PLC are as follows:

DIRECTORS
                                                                     Principal
Name                            Business Address                     Occupation

Michael B. Cannan               c/o Sinclair Henderson Limited       Director
                                23 Cathedral Yard
                                Exeter EX11HB
Russell Cleveland               c/o Sinclair Henderson Limited       Director
                                23 Cathedral Yard
                                Exeter EX11HB
Ernest J. Fenton                c/o Sinclair Henderson Limited       Director
                                23 Cathedral Yard
                                Exeter EX11HB
Lord Mark Fitzalan Howard OBE   c/o Sinclair Henderson Limited       Director
                                23 Cathedral Yard
                                Exeter EX11HB
C. A. Rundell, Jr.              c/o Sinclair Henderson Limited       Director
                                23 Cathedral Yard
                                Exeter EX11HB
William W. Vanderfelt           c/o Sinclair Henderson Limited       Director
                                23 Cathedral Yard
                                Exeter EX11HB

OFFICERS

None








                                                                       EXHIBIT 1

                JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)

     The  undersigned  acknowledge  and agree that the  foregoing  statement  on
Schedule 13D is filed on behalf of each of the  undersigned and that all of each
of the  undersigned  without the  necessity  of filing  additional  joint filing
agreements.  The undersigned  acknowledge that each shall be responsible for the
timely filing of such  amendments,  and for the completeness and accuracy of the
information  concerning it contained  therein,  but shall not be responsible for
the completeness and accuracy of the information  concerning the others,  except
to the  extent  it knows or has  reason to  believe  that  such  information  is
inaccurate.  This  Joint  Filing  Agreement  may be  executed  in any  number of
counterparts  and all of such  counterparts  taken together shall constitute one
and the same instrument.

                              RENAISSANCE CAPITAL GROWTH & INCOME FUND III, INC.




                               By:     ______________________________
                             Name:     Russell Cleveland
                            Title:     President and Chief Executive Officer


                               RENAISSANCE US GROWTH & INCOME TRUST PLC




                               By:     _______________________________
                             Name:     Russell Cleveland
                            Title:     Director