Exhibit 3.6

                            CERTIFICATE OF AMENDMENT
                                       OF

                AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                             OF OBJECT DESIGN, INC.

         Object Design, Inc., a corporation  organized and existing under and by
virtue of the  General  Corporation  Law of the State of  Delaware,  DOES HEREBY
CERTIFY:

FIRST:            That by unanimous written consent of the Board of Directors of
                  said corporation  resolutions were duly adopted  proposing and
                  declaring advisable that the Amended and Restated  Certificate
                  of  Incorporation  of said  corporation  (the  "Certificate of
                  Incorporation")   be  amended  and  that  such   amendment  be
                  submitted to the  stockholders  of the  Corporation  for their
                  consideration, as follows:

     RESOLVED:             That  the  Board of  Directors  hereby  resolves  and
                           declares it  advisable  that the Amended and Restated
                           Certificate  of   Incorporation  of  the  Corporation
                           ("Certificate of  Incorporation")  be further amended
                           by deleting the old Article First and inserting a new
                           Article First in its stead which shall be and read as
                           follows in its entirety:

                           FIRST:    The   name   of   the   corporation    (the
                           "Corporation") is eXcelon Corporation.

     RESOLVED:             That  the   foregoing   proposed   amendment  of  the
                           Corporation's   Certificate   of   Incorporation   be
                           submitted for consideration of the stockholders.

     RESOLVED:             That  following  the  stockholders'  approval of such
                           amendment  as  required by law,  the  officers of the
                           Corporation be, and they hereby are, and each of them
                           acting  singly  hereby  is,  authorized,  for  and on
                           behalf of the  Corporation  and in its  name,  (a) to
                           execute and file with the  Secretary  of State of the
                           State of  Delaware  a  Certificate  of  Amendment  of
                           Certificate  of   Incorporation  of  the  Corporation
                           setting forth such  amendment in the form approved by
                           the  stockholders  and (b) to take any and all  other
                           actions  necessary or  appropriate  to give effect to
                           such amendment.

SECOND:           That  thereafter,   a  meeting  of  the  stockholders  of  the
                  Corporation   was  duly  called  and  held,   upon  notice  in
                  accordance with Section 222 of the General  Corporation Law of
                  the State of Delaware,  at which meeting the necessary  number
                  of  shares as  required  by  statute  and the  Certificate  of
                  Incorporation  of the  Corporation  were voted in favor of the
                  aforesaid amendment.

THIRD:            That the  aforesaid  amendment  was duly adopted in accordance
                  with the  applicable  provisions of Section 242 of the General
                  Corporation Law of the State of Delaware.

FOURTH:           That the aforesaid  amendment shall become  effective at 12:01
                  a.m. on January 31, 2000.


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         IN  WITNESS  WHEREOF,   said  Object  Design,   Inc.  has  caused  this
certificate to be signed by Robert N. Goldman, its Chairman and President,  this
27th day of January, 2000.

                                              OBJECT DESIGN, INC.

                                              By: /s/ Robert N. Goldman
                                                 -------------------------------
                                                      Its President