SIGMA MANAGEMENT III LP
SC 13G, 1999-02-12
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                                  SCHEDULE 13G

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (Amendment No. )*

                                 ISS GROUP, INC
                        --------------------------------
                                (Name of Issuer)

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

                                   450306 10-5
                        --------------------------------
                                 (CUSIP Number)



*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the Notes)

                                Page 1 of 9 Pages

<PAGE>

- -----------------------------                          -------------------------
CUSIP No. 450306105                   13G                  Page 2 of 9 Pages
- -----------------------------                          -------------------------

- -------- -----------------------------------------------------------------------
   1     NAME OF REPORTING PERSONS
         S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

         Sigma Partners III, L.P.            94-3198719
- -------- -----------------------------------------------------------------------
   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)   [ ]
                                                                       (b)   [X}
- -------- -----------------------------------------------------------------------
   3     SEC USE ONLY

- -------- -----------------------------------------------------------------------
   4     CITIZENSHIP OR PLACE OF ORGANIZATION
         California
- -------- -----------------------------------------------------------------------
   NUMBER OF       5     SOLE VOTING POWER
    SHARES               880,775
 BENEFICIALLY    ------- -------------------------------------------------------
OWNED BY EACH      6     SHARED VOTING POWER                                    
  REPORTING              0                                                      
   PERSON        ------- -------------------------------------------------------
    WITH           7     SOLE DISPOSITIVE POWER                                 
                         880,775
                 ------- -------------------------------------------------------
                   8     SHARED DISPOSITIVE POWER                               
                         0                                                      
- - -------- ---------------------------------------------------------------------
   9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         880,775
- -------- -----------------------------------------------------------------------
   10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                                                                             [ ]
- -------- -----------------------------------------------------------------------
   11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
         5.3%
- -------- -----------------------------------------------------------------------
   12    TYPE OF REPORTING PERSON*
         PN
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                Page 2 of 9 Pages


<PAGE>

- -----------------------------                          -------------------------
CUSIP No. 450306105                  13G                  Page 3 of 9 Pages
- -----------------------------                          -------------------------

- -------- -----------------------------------------------------------------------
   1     NAME OF REPORTING PERSONS
         S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

         Sigma Investors III, L.P.               94-3213838
- -------- -----------------------------------------------------------------------
   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)   [ ]
                                                                       (b)   [X}
- -------- -----------------------------------------------------------------------
   3     SEC USE ONLY

- -------- -----------------------------------------------------------------------
   4     CITIZENSHIP OR PLACE OF ORGANIZATION
         California
- -------- -----------------------------------------------------------------------
   NUMBER OF       5     SOLE VOTING POWER
    SHARES               173,572
 BENEFICIALLY    ------- -------------------------------------------------------
OWNED BY EACH      6     SHARED VOTING POWER                                    
  REPORTING              0                                                      
   PERSON        ------- -------------------------------------------------------
    WITH           7     SOLE DISPOSITIVE POWER                                 
                         173,572
                 ------- -------------------------------------------------------
                   8     SHARED DISPOSITIVE POWER                               
                         0                                                      
- -------- -----------------------------------------------------------------------
   9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         173,572
- -------- -----------------------------------------------------------------------
   10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                                                                             [ ]
- -------- -----------------------------------------------------------------------
   11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
         .10%
- -------- -----------------------------------------------------------------------
   12    TYPE OF REPORTING PERSON*
         PN
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                Page 3 of 9 Pages

<PAGE>

- -----------------------------                          -------------------------
CUSIP No. 450306105                  13G                  Page 4 of 9 Pages
- -----------------------------                          -------------------------

- -------- -----------------------------------------------------------------------
   1     NAME OF REPORTING PERSONS
         S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

         Sigma Management III, L.P.          94-3198717
- -------- -----------------------------------------------------------------------
   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)   [ ]
                                                                       (b)   [X}
- -------- -----------------------------------------------------------------------
   3     SEC USE ONLY

- -------- -----------------------------------------------------------------------
   4     CITIZENSHIP OR PLACE OF ORGANIZATION
         California
- -------- -----------------------------------------------------------------------
   NUMBER OF       5     SOLE VOTING POWER
    SHARES               1,068,422
 BENEFICIALLY    ------- -------------------------------------------------------
OWNED BY EACH      6     SHARED VOTING POWER                                    
  REPORTING              0                                                      
   PERSON        ------- -------------------------------------------------------
    WITH           7     SOLE DISPOSITIVE POWER                                 
                         1,068,422
                 ------- -------------------------------------------------------
                   8     SHARED DISPOSITIVE POWER                               
                         0                                                      
- -------- -----------------------------------------------------------------------
   9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         1,068,422
- -------- -----------------------------------------------------------------------
   10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                                                                             [ ]
- -------- -----------------------------------------------------------------------
   11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
         6.3%
- -------- -----------------------------------------------------------------------
   12    TYPE OF REPORTING PERSON*
         PN
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                Page 4 of 9 Pages

<PAGE>

- -----------------------------                          -------------------------
CUSIP No. 450306105                  13G                  Page 5 of 9 Pages
- -----------------------------                          -------------------------

- -------- -----------------------------------------------------------------------
   1     NAME OF REPORTING PERSONS
         S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

         Sigma Associates III, L.P.               94-3202010
- -------- -----------------------------------------------------------------------
   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)   [ ]
                                                                       (b)   [X}
- -------- -----------------------------------------------------------------------
   3     SEC USE ONLY

- -------- -----------------------------------------------------------------------
   4     CITIZENSHIP OR PLACE OF ORGANIZATION
         California
- -------- -----------------------------------------------------------------------
   NUMBER OF       5     SOLE VOTING POWER
    SHARES               14,075
 BENEFICIALLY    ------- -------------------------------------------------------
OWNED BY EACH      6     SHARED VOTING POWER                                    
  REPORTING              0                                                      
   PERSON        ------- -------------------------------------------------------
    WITH           7     SOLE DISPOSITIVE POWER                                 
                         14,075
                 ------- -------------------------------------------------------
                   8     SHARED DISPOSITIVE POWER                               
                         0                                                      
- -------- -----------------------------------------------------------------------
   9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         14,075
- -------- -----------------------------------------------------------------------
   10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 
                                                                             [ ]
- -------- -----------------------------------------------------------------------
   11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
         .8%
- -------- -----------------------------------------------------------------------
   12    TYPE OF REPORTING PERSON*
         PN
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                Page 5 of 9 Pages

<PAGE>

Item 1:  Issuer

(a)      Issuer:  ISS GROUP, INC.

(b)      Address of Principal Office:

                  6600 PEACHTREE-DUNWOODY ROAD
                  300 EMBASSY ROW, SUITE 500

(c)      Place of Organization:

                  ATLANTA, GA 30328

(d)      Title of Class of Securities:  Common Stock

(e)      CUSIP No.:  450306 10 5

Item 2:  Filing Persons
                           Sigma Partners III, L.P. (SP III)
                           Sigma Associates III, L.P. (SA III)
                           Sigma Investors III, L.P. (SI III)
                           Sigma Management III, L.P. (SM III)



Item 3:  N/A

Item 4:  Ownership               SP III       SA III       SA III       SM III

(a) Beneficial Ownership         880,775      173,572      14,075      1,068,422

(b) Percentage of Class            5.3%         .10%         .8%          6.2%

(c)   Sole Voting Power:         880,775      173,572      14,075      1,068,422

      Shared Voting Power:          0             0           0            0

      Sole Dispositive Power:    880,775      173,572      14,075      1,068,422

      Shared Dispositive Power:     0             0           0            0




                                Page 6 of 9 Pages

<PAGE>

In addition to the above, each of Lawrence G. Finch, Clifford L. Haas, Robert E.
Davoli and Wade  Woodson,  the four general  partners of Sigma  Management  III,
L.P.,  may be deemed to share voting and  dispositive  power over the  1,068,422
shares of ISS GROUP, INC owned by Sigma Management III, L.P.

Item 5:  Not Applicable

Item 6:

Under certain  circumstances  set forth in SP III's,  SM III's,  SI III's and SA
III's limited partnership agreements,  the general partners and limited partners
of each of such funds have the right to receive  dividends from, or the proceeds
from the sale of the common stock of Issuer owned by each such fund.

Item 7:  Not Applicable

Item 8:  Not Applicable

Item 9:  Not Applicable

Item 10: Not Applicable

Exhibit A:        Joint Filing Statement



                                Page 7 of 9 Pages


<PAGE>




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.

Date: ________________________


                                         SIGMA PARTNERS III, L.P.

                                         By its General Partner,
                                         Sigma Management III, L.P.


                                         By:   Clifford L. Hass
                                            ------------------------------------
                                               Clifford L. Haas, General Partner



                                         SIGMA INVESTORS III, L.P.

                                         By  its General Partner,
                                         Sigma Management III, L.P.


                                         By:
                                            ------------------------------------



                                         SIGMA ASSOCIATES III, L.P.


                                         By its General Partner,
                                         Sigma Management III, L.P.


                                         By:   Clifford L. Hass
                                            ------------------------------------
                                               Clifford L. Haas, General Partner


                                         SIGMA MANAGEMENT III, L.P.


                                         By:   Clifford L. Hass
                                            ------------------------------------
                                               Clifford L. Haas, General Partner



                                Page 8 of 9 Pages


<PAGE>


                                    EXHIBIT A


We, the undersigned, hereby express our agreement that the attached Schedule 13G
is filed on behalf of each of us.

Date: ________________________

                                         SIGMA PARTNERS III, L.P.

                                         By its General Partner,
                                         Sigma Management III, L.P.


                                         By:   Clifford L. Hass
                                            ------------------------------------
                                               Clifford L. Haas, General Partner



                                         SIGMA INVESTORS III, L.P.

                                         By  its General Partner,
                                         Sigma Management III, L.P.


                                         By:
                                            ------------------------------------



                                         SIGMA ASSOCIATES III, L.P.


                                         By its General Partner,
                                         Sigma Management III, L.P.


                                         By:   Clifford L. Hass
                                            ------------------------------------
                                               Clifford L. Haas, General Partner


                                         SIGMA MANAGEMENT III, L.P.


                                         By:   Clifford L. Hass
                                            ------------------------------------
                                               Clifford L. Haas, General Partner


                                Page 9 of 9 Pages




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