EXHIBIT 31.1


                            CERTIFICATION PURSUANT TO
                              18 USC, SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 302 OF THE SARBANES OXLEY ACT OF 2002


I, Frederick J. Slack, certify that:

     1. I have reviewed this  quarterly  report on Form 10-QSB of 3Si, Inc. (the
     "Registrant" or the "Company");

     2. Based on my knowledge, this report does not contain any untrue statement
     of a material fact or omit to state a material  fact  necessary in order to
     make the statements  made, in light of the  circumstances  under which such
     statements  were made, not misleading with respect to the period covered by
     this report;

     3. Based on my knowledge,  the financial  statements,  and other  financial
     information  included  in  this  report,  fairly  present  in all  material
     respects the financial  condition,  results of operations and cash flows of
     the Registrant as of, and for, the periods presented in this report;

     4. I am responsible for  establishing and maintaining  disclosure  controls
     and procedures  (as defined in Exchange Act Rules  13a-15(e) and 15d-15(e))
     for the Registrant and have;

          a.  Designed such disclosure controls and  procedures, or caused  such
     disclosure controls and procedure to be designed under our supervision,  to
     ensure that material information relating to the Registrant  (including its
     consolidated  subsidiaries),  is made  known to us by others  within  those
     entities,  particularly  during the  period in which  this  report is being
     prepared;

          b. Evaluated the effectiveness of the Registrant's disclosure controls
     and  procedures  and  presented  in this report our  conclusions  about the
     effectiveness of the disclosure  controls and procedures,  as of the end of
     the period covered by this report based upon such evaluations; and

          c. Disclosed  in  this  report any change in the registrant's internal
     control over financial reporting that occurred during the registrant's most
     recent fiscal  quarter (the  registrant's  fourth quarter in the case of an
     annual report) that has  materially  affected,  or is reasonably  likely to
     materially  affect,  the  registrant's   internal  control  over  financial
     reporting: and

     5. I have disclosed, based on my most recent evaluation of internal control
     over  financial  reporting,  to the  Registrant's  auditors  and the  Audit
     Committee of the Registrant's Board of Directors (or persons performing the
     equivalent function):

          a. All significant deficiencies and material  weaknesses in the design
     or  operation  of  internal  control  over  financial  reporting  which are
     reasonably  likely to adversely affect the registrant's  ability to record,
     process, summarize and report financial information; and

          b. Any fraud,  whether or not material,  that involves  management  or
     other employees who have a significant  role in the  registrant's  internal
     control over financial reporting


Dated:  September 15, 2006    /s/  Frederick J.  Slack
                             ---------------------------------------------------
                             Frederick J.  Slack, Chief Executive Officer, Chief
                             Financial Officer