SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                               ------------------


                                  SCHEDULE 13D



                    Under the Securities Exchange Act of 1934

                                 Amendment No. 2

                        Integrated Security Systems, Inc.
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                                (Name of Issuer)

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

                                    45812J101
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                                 (CUSIP Number)

                                Russell Cleveland
                         Renaissance Capital Group, Inc.
                  8080 N. Central Expressway, Suite 210, LB-59
                            Dallas, Texas 75206-1857
                                 (214) 891-8294
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                 (Name, Address, and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  July 27, 2001
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             (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 which 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)







CUSIP No. 45812J101                                     13D
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1.      NAME OF REPORTING PERSON                  I.R.S. IDENTIFICATION NUMBER
        Renaissance Capital Growth & Income Fund III, Inc.          75-2533518
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2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (a)      [ ]
        (b)      [x]
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3.      SEC USE ONLY
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4.      SOURCE OF FUNDS
        WC
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5.      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
        O ITEM 2(d) OR 2(e)
        [ ]
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6.      CITIZENSHIP OR PLACE OF ORGANIZATION
        Texas
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NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:
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        7.      SOLE VOTING POWER
                22,444,758
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        8.      SHARED VOTING POWER
                None
        ------------------------------------------------------------------------
        9.      SOLE DISPOSITIVE POWER
                22,444,758
        ------------------------------------------------------------------------
        10.     SHARED DISPOSITIVE POWER
                None
 ------------------------------------------------------------------------------
11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        22,444,758
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12.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
        SHARES           [  ]
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13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN  ROW (11)
        68.4%
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14.     TYPE OF REPORTING PERSON
        IV






CUSIP No. 45812J101                                     13D
 ------------------------------------------------------------------------------
1       NAME OF REPORTING PERSON                   I.R.S. IDENTIFICATION NUMBER
        Renaissance US Growth & 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 ITEM 2(d) OR 2(e)  [  ]
 ------------------------------------------------------------------------------
6.      CITIZENSHIP OR PLACE OF ORGANIZATION
        England
 ------------------------------------------------------------------------------
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:
 ------------------------------------------------------------------------------
        7.      SOLE VOTING POWER
                21,608,445
        ------------------------------------------------------------------------
        8.      SHARED VOTING POWER
                None
        ------------------------------------------------------------------------
        9.      SOLE DISPOSITIVE POWER
                21,608,445
        ------------------------------------------------------------------------
        10.     SHARED DISPOSITIVE POWER
                None
 ------------------------------------------------------------------------------
11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        21,608,445
 ------------------------------------------------------------------------------
12.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
        SHARES           [  ]
 ------------------------------------------------------------------------------
13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN  ROW (11)
        67.5%
------------------------------------------------------------------------------
14.     TYPE OF REPORTING
        IV






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").

     Certain information  concerning the directors and executive officers of the
Reporting  Persons is set forth on Attachment 1 attached hereto and incorporated
herein by reference.

     (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, except as 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  $4,579,589.  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  $4,413,463.  The source of such funds was
capital of Renaissance PLC.

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  22,444,758  Common  Shares,  and
Renaissance  PLC  beneficially  owns  21,608,445  Common  Shares.  The Reporting
Persons  beneficially own 44,053,203 Common Shares. Based upon information filed
with the Securities and Exchange Commission and using SEC computation rules, the
Common  Shares  beneficially  owned by  Renaissance  III,  Renaissance  PLC, and


together represent approximately 68.4%, 67.5%, and 81.5%,  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
393,259 shares of Common Stock; 814,299 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 393,258 shares of Common Stock;  808,617 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.

     (b) Holders of Series D Preferred  Stock are  entitled to one vote for each
share of Common  Stock into which such share of Series D  Preferred  Stock could
then be  converted.  Presently,  the holder of each share of Series D  Preferred
stock is entitled to 25 votes.  Holders of Series F Preferred Stock are entitled
to vote with the  holders of Common  Stock,  the Series D Preferred  Stock,  the
Series E Preferred Stock , and the Series G Preferred Stock as a single class on
all matters on which  stockholders are entitled to vote,  including the election
of directors, except as otherwise required by law. Holders of Series F Preferred
Stock are also entitled to vote with any other class of equity  securities which
may vote with the holders of the Common  Stock as a single class with respect to
any  matter.  Holders of Series F  Preferred  Stock are  entitled to a number of
votes per share of Series F  Preferred  Stock  equal to the  number of shares of
Common Stock into which the shares of Series F Preferred  Stock are  convertible
on the record  date of the  determination  of  stockholders  entitled to receive
notice of and to vote on such matter. In addition, the consent of holders of 80%
of the  Series F  Preferred  Stock  and the  Series G  Preferred  Stock,  voting
together  as a single  class,  will be  required to (a)  authorize,  create,  or
increase the  authorized  amount of any class of senior  stock or parity  stock,
other than Preferred Stock of the same class or securities to evidence bank debt
or asset  securitization  or (b) authorize a merger,  consolidation,  or sale of
assets, other than in the ordinary course of business, of the Company, including
the capital stock of the Company's  subsidiaries.  The consent of holders of 80%
of the Series F Preferred  Stock,  voting as a sing  class,  will be required to
approve any action to amend the Company's certificate of incorporation or bylaws
that would  materially and adversely affect the rights of the Series F Preferred
Stock.






     Holders  of Series G  Preferred  Stock  will be  entitled  to vote with the
holders of Common Stock,  the Series D Preferred  Stock,  the Series E Preferred
Stock,  and the Series F  Preferred  Stock as a single  class on all  matters on
which  stockholders  are entitled to vote,  including the election of directors,
except as  otherwise  required by law.  holders of Series G Preferred  Stock are
also entitled to vote with any other class of equity  securities  which may vote
with the  holders of the  Common  Stock as a single  class  with  respect to any
matter.  Holders of Series G Preferred  Stock are  entitled to a number of votes
per share of Series G  Preferred  Stock  equal to the number of shares of Common
Stock into which the Shares of Series G Preferred  Stock are  convertible on the
record date of the  determination of stockholders  entitled to receive notice of
and to vote on such matter.  In  addition,  the consent of holders of 80% of the
Series G Preferred Stock and the Series F Preferred Stock,  voting together as a
single  class,  will be required  (a) to  authorize,  create,  or  increase  the
authorized  amount of any class of senior  stock or  parity  stock,  other  than
Preferred  Stock of the same  class  or  securities  to  evidence  bank  debt or
securitization  or (b)  authorize  a merger,  consolidation,  or sale of assets,
other than in the ordinary  course of business,  of the Company,  including  the
capital  stock of the Company's  subsidiaries.  The consent of holders of 80% of
the Series G  Preferred  Stock,  voting as a single  class,  will be required to
approve any action to amend the Company's certificate of incorporation or bylaws
that would  materially and adversely affect the rights of the Series G Preferred
Stock.

     In addition to their right to vote with the holders of the Common  Stock on
the election of directors, the Reporting Persons, as the holders of the Series G
Preferred Stock and the holders of the Series F Preferred Stock, voting together
as a single  class,  are  entitled  to elect  two  additional  directors  to the
Company's board of directors.

     Each of the  Reporting  Persons  has or will have upon the  exercise of the
warrants  issued to it by the  Company the sole power to vote and dispose of all
of the Common Shares that it beneficially  owns.  None of the Reporting  Persons
shares  voting or  disposition  power with any person with respect to the Common
Shares.

     (c) No transaction in the Common Shares was effected by a Reporting  Person
during the past 60 days,  except as follows:  the issuance on July 27, 2001,  of
3,000  shares of Series G Preferred  Stock for $75,000 and the issuance of 1,000
shares of  Series F  Preferred  Stock for  $25,000  to  Renaissance  III and the
issuance  of 3,000  shares  of Series G  Preferred  Stock  for  $75,000  and the
issuance of 1,000 shares of Series F Preferred  Stock for $25,000 to Renaissance
PLC.

     (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.


                                       2



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)


                                   SIGNATURES

     After reasonable inquire and to the best of their individual  knowledge and
belief,  the  signatories  below certify that the  information set forth in this
statement is true, complete, and correct as of this 17th day of September, 2001.

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

                           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





                                  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







                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
                    itle:     President and Chief Executive Officer


                              RENAISSANCE US GROWTH & INCOME TRUST PLC




                      By:     ___________________________________________
                    Name:     Russell Cleveland
                   Title:     Director