Exhibit 5.1
                                  HALE AND DORR
                               Counsellors at Law

                  60 State Street, Boston, Massachusetts 02109
                          617-526-6000.FAX 617-526-5000

                                  June 11, 1996

EIS International, Inc. 
1351 Washington Boulevard 
Stamford, CT 06902

Dear Sirs:

     We have assisted in the preparation and filing with the Securities and
Exchange Commission (the "Commission") of a Registration Statement on Form S-3
(the "Registration Statement"), relating to the sale of up to 148,962 shares of
Common Stock, $.01 par value per share (the "Shares"), of EIS International,
Inc., a Delaware corporation (the "Company"), issuable upon the exercise of
certain warrants of the Company ("the Warrants").

     We have examined the Certificate of Incorporation and By-laws of the
Company, and all amendments thereto, and have examined and relied upon the
originals, or copies certified to our satisfaction, of such records of meetings
of directors and stockholders of the Company, documents and other instruments as
in our judgment are necessary or appropriate to enable us to render the opinions
expressed below.

     We assume that appropriate action will be taken, prior to the offer and
sale of the Shares, to register and qualify the Shares for sale under all
applicable state securities or "blue sky" laws.

     In our examination of the foregoing documents, we have assumed the
genuineness of all signatures and the authenticity of all documents submitted to
us as originals, the conformity to original documents of all documents submitted
to us as certified or photostatic copies, and the authenticity of the originals
of such latter documents.

     We express no opinion as to the laws of any State or jurisdiction other
than the laws of the Commonwealth of Massachusetts, the General Corporation Law
Statute of the State of Delaware and the Federal law of the United States of
America.

     Based upon the foregoing, we are of the opinion that the Shares have been
duly authorized for issuance and, when issued in accordance with the terms of
the Warrants, will be legally issued, fully paid and non-assessable.

     We hereby consent to the use of our name in the Registration Statement and
under the caption "Legal Matters" in the related Prospectus and consent to the
filing of this opinion as an Exhibit to the Registration Statement.

                                                     Very truly yours,

                                                     /s/ Hale and Dorr

                                                     HALE AND DORR