Document:

<PAGE>

                                                                   Exhibit 10.1

                CONSENT OF ERNST & YOUNG, INDEPENDENT AUDITORS

   We consent to the reference to our firm under the caption "Selected
Financial Data" in this Annual Report (Form 20-F) for the year ended December
31, 2001, and to the incorporation by reference in the Registration Statement
on Form F-3 (File No. 333-13802) and Registration Statements on Form S-8 (File
Nos. 333-06850, 333-11384, 333-12326, 333-13224, 333-13330 and 333-13494)
pertaining to the Executive Share Option Scheme, the 1997 Share Option Scheme,
as amended, the 1997 Director Share Option Scheme and the 1999 Employee Stock
Purchase Plan of IONA Technologies PLC, the 1997 Stock Plan of Genesis
Development Corporation, the Stock Plan of Object-Oriented Concepts, Inc. and
the 1999 Stock Option Plan of Netfish Technologies, Inc., of our report dated
January 22, 2002, with respect to the consolidated financial statements of IONA
Technologies PLC included in this Annual Report (Form 20-F) for the year ended
December 31, 2001.

                                          ERNST & YOUNG

Dublin, Ireland
May 31, 2002<PAGE>

                                   Exhibit 4.1
                                   -----------

1.       The Option Agreement between the Company and Johan Ruthstrom dated
         January 1, 2002.

2.       The Option Agreement between the Company and Stephanie Abner dated
         December 21, 2000.

3.       The Option Agreement between the Company and Sue Badillo dated
         December 21, 2000.

4.       The Option Agreement between the Company and Melissa Barrett dated
         December 21, 2000.

5.       The Option Agreement between the Company and Pat Brady dated
         December 21, 2000.

6.       The Option Agreement between the Company and Nebojsa Brajkovic dated
         December 21, 2000.

7.       The Option Agreement between the Company and Julie Brinkman dated
         December 21, 2000.

8.       The Option Agreement between the Company and Jennifer Byerly dated
         December 21, 2000.

9.       The Option Agreement between the Company and Angela Chamberlin dated
         December 21, 2000.

10.      The Option Agreement between the Company and Fred Cuthbertson dated
         December 21, 2000.

11.      The Option Agreement between the Company and Dennis Dahl dated
         December 21, 2000.

12.      The Option Agreement between the Company and Billie Darrow dated
         December 21, 2000.

13.      The Option Agreement between the Company and Maureen Davis dated
         December 21, 2000.

14.      The Option Agreement between the Company and Linda Duvall dated
         December 21, 2000.

15.      The Option Agreement between the Company and Sherry Estes dated
         December 21, 2000.

<PAGE>

16.      The Option Agreement between the Company and Kim Hammel dated
         December 21, 2000.

17.      The Option Agreement between the Company and Tricia Johnson dated
         December 21, 2000.

18.      The Option Agreement between the Company and Rob Martini dated
         December 21, 2000.

19.      The Option Agreement between the Company and Mike O'Heron dated
         December 21, 2000.

20.      The Option Agreement between the Company and Dana Parker dated
         December 21, 2000.

21.      The Option Agreement between the Company and Charles Paterson dated
         December 21, 2000.

22.      The Option Agreement between the Company and Mike Peplinski dated
         December 21, 2000.

23.      The Option Agreement between the Company and Scott Sangster dated
         December 21, 2000.

24.      The Option Agreement between the Company and Donna Sundstrom dated
         December 21, 2000.

25.      The Option Agreement between the Company and Rachel Vandenbark dated
         December 21, 2000.

26.      The Option Agreement between the Company and Christine Walls dated
         December 21, 2000.

27.      The Option Agreement between the Company and Richard Beedenbender dated
         May 14, 2001.

28.      The Option Agreement between the Company and Richard Beedenbender dated
         May 14, 2001.

29.      The Option Agreement between the Company and Kim Berecz dated
         May 14, 2001.

30.      The Option Agreement between the Company and Fred Hale dated
         May 14, 2001.

31.      The Option Agreement between the Company and Naresh Hingorani dated
         May 14, 2001.

<PAGE>

32.      The Option Agreement between the Company and Patti Lee dated
         May 14, 2001.

33.      The Option Agreement between the Company and Karen O'Brien dated
         May 14, 2001.

34.      The Option Agreement between the Company and Edward Sands dated
         May 14, 2001.

35.      The Option Agreement between the Company and Whitney Stengel dated
         May 14, 2001.

36.      The Option Agreement between the Company and Jim Watkins dated
         May 14, 2001.

37.      The Option Agreement between the Company and Jim Watkins dated
         May 14, 2001.<PAGE>

                                   Exhibit 4.2
                                   -----------

                        THE DESCARTES SYSTEMS GROUP INC.
                        --------------------------------

                   TERMS AND CONDITIONS OF STOCK OPTION GRANT
                   ------------------------------------------

                                    ARTICLE 1
                                    ---------

                                   DEFINITIONS
                                   -----------

1.1      When used herein, the following terms shall have the following
         meanings:

         "Affiliate" - has the meaning given to that term in the Business
         Corporations Act (Ontario).

         "Board" - means the Board of Directors of the Company.

         "Committee"- means a committee of the members of the Board.

         "Company" - means The Descartes Systems Group Inc. and its Affiliates.

         "Exercise Notice" - means a notice in writing in the form attached
         hereto as Schedule "A" signed by the Recipient stating the Recipient's
         intention to exercise a particular Option.

         "Exercise Price" - means the price at which a Share may be purchased
         pursuant to the exercise of an Option.

         "Exercise Term" - means the period of time during which Options may be
         exercised.

         "Exchange" - means The Toronto Stock Exchange, the National Market
         System of the National Association of Securities Dealers Automated
         Quotation System or any other stock exchange on which the Shares are
         listed and posted for trading or quoted.

         "Option" - means a right that may be granted to a Recipient pursuant to
         the terms of this Agreement that allows the Recipient to purchase
         Shares at a set price for a future period that does not exceed the
         expiry date set out in the grant.

         "Option Agreement" - means a signed written agreement evidencing the
         terms and conditions upon which an Option is granted under the Terms
         and Conditions, substantially in the form set out in Schedule "B".

<PAGE>

         "Recipients" - means those key employees of the Company, or to a
         personal holding corporation wholly owned by such Recipient(s) or to a
         registered retirement savings plan established for the sole benefit of
         such Recipient(s), who are granted Options pursuant to these Terms and
         Conditions.

         "Shares" - means the authorized and unissued common shares of the
         Company.

         "Terms and  Conditions" - means this  document,  being The Descartes
         Systems Group Inc.  Terms and Conditions of Stock Option Grant.

                                    ARTICLE 2
                                    ---------

                               EXERCISE OF OPTIONS
                               -------------------

2.1      Non-transferability: Options granted pursuant to these Terms and
         -------------------
         Conditions may only be exercised by a Recipient personally and no
         assignment or transfer of Options whether voluntary, involuntary, by
         operation of law or otherwise, shall vest any interest or right in such
         Options whatsoever in any assignee or transferee, but immediately upon
         any assignment or transfer, or any attempt to make the same, such
         Options shall terminate and be of no further effect. Notwithstanding
         this Section 2.1, in the event that a Recipient who is an officer,
         director or employee of the Company dies prior to his or her Options
         having been exercised, these Options may, subject to the Terms and
         Conditions, be exercised by the person or persons to whom the
         Recipient's rights under the Option pass by will or applicable law, or
         if no person has such right, by the Recipient's executors or
         administrators at any time, or from time to time, but in no event later
         than the expiration date specified in the Option.

2.2      Exercise Term:
         -------------

              (a) Options granted to Recipients may only be exercisable by the
Recipient if all conditions to vesting set out in the Option Agreement have been
satisfied.

              (b) In no event shall the Exercise Term of an Option exceed the
term set out in the Option Agreement.

              (c) Subject to Subsections 2.2(a) and 2.2(b) and the Terms and
Conditions, Options may be exercised by means of giving an Exercise Notice
addressed to the Company.

2.3      Exercise Price: The Exercise Price of any Option shall be the price
         --------------
         set out in the Option Agreement.

2.4      Payment of Exercise Price: The Exercise Price shall be fully paid in
         -------------------------
         cash or loans at the time of exercise. No Shares shall be issued or
         transferred until full cash payment has been received therefor. As soon
         as practicable after receipt of any Exercise Notice and full payment,
         the Company shall deliver to the eligible Recipient, a certificate or
         certificates representing the acquired Shares.

<PAGE>

2.5      Termination of Employment for Cause or Removal of a Director: Where a
         ------------------------------------------------------------
         Recipient's employment with the Company is terminated for cause (as
         such term is defined in law) or where a Recipient who is a director of
         the Company is removed as a director prior to the end of his or her
         term, each Option granted to that Recipient that has vested and each
         Option granted to that Recipient that has not then vested shall,
         subject to the discretion of the Board, the Committee or an officer,
         immediately terminate.

2.6      Death: In the event of the death of a Recipient, all Options which have
         -----
         vested may be exercised by the Recipient's estate at any time within 6
         months from the date of death, or for such longer period of time as the
         Board, the Committee or an officer may determine.

2.7      Termination of Employment for Other than Cause or Death: Where a
         -------------------------------------------------------
         Recipient's employment with the Company terminates for any reason other
         than as contemplated in Sections 2.5 or 2.6 above, or in the event a
         Director is not re-elected to the Board of Directors, each Option
         granted to that Recipient that has not then vested shall, subject to
         the discretion of the Board, the Committee or an officer, immediately
         terminate. In such cases, all Options granted to such Recipients that
         have vested may be exercised by the Recipient at any time within 6
         months of the date of termination, or non-re-election, as the case may
         be, or for such longer period of time as the Board, the Committee or an
         officer may determine.

                                   ARTICLE 3
                                   ---------

                          REORGANIZATION OF THE COMPANY
                          -----------------------------

3.1      General: The existence of any Options shall not affect in any way the
         -------
         right or power of the Company or its shareholders to make or authorize
         any adjustment, recapitalization, reorganization or any other change in
         the Company's capital structure or its business, or any amalgamation,
         combination, merger or consolidation involving the Company or to create
         or issue any bonds, debentures, shares of any class or other securities
         of the Company or the rights and conditions attaching thereto or to
         effect the dissolution or liquidation of the Company or any sale or
         transfer of all or any part of its assets or business, or any other
         corporate act or proceeding, whether of similar character or otherwise.

3.2      Reorganization of Company's Capital: Should the Company effect a
         -----------------------------------
         subdivision or consolidation of shares or any similar capital
         reorganization or a payment of a stock dividend (other than a stock
         dividend which is in lieu of a cash dividend), or should any other
         change be made in the capitalization of the Company which, in the
         opinion of the Board, the Committee or an officer, would warrant an
         adjustment to the number of Shares which may be acquired on the
         exercise of any outstanding Options and/or an adjustment to the
         Exercise Price thereof in order to preserve proportionately the rights
         and obligations of Recipients, such adjustment shall be made as may be
         equitable and appropriate to that end. Notwithstanding anything
         hereinabove, a decision of the Board,

<PAGE>

         the Committee or an officer in respect of any and all matters falling
         within the scope of this Section or Section 3.3 shall be final and
         without recourse on the part of any Recipient and his or her heirs or
         legal representatives.

3.3      Other Events Affecting the Company: In the event of an amalgamation,
         ----------------------------------
         combination, merger or other reorganization involving the Company, by
         exchange of shares of any class, by sale or lease of assets, or
         otherwise, which in the opinion of the Board, the Committee or an
         officer warrants an adjustment to the number of Shares which may be
         acquired on the exercise of any outstanding Options and/or an
         adjustment to the Exercise Price thereof in order to preserve
         proportionately the rights and obligations of Recipients, such
         adjustments shall be made as may be equitable and appropriate to that
         end.

3.4      Immediate Exercise of Options: Where the Board, the Committee or an
         -----------------------------
         officer determines that the adjustments provided for in Sections 3.2
         and 3.3 would not preserve proportionately the rights and obligations
         of Recipients in the circumstances or otherwise determines that it is
         appropriate the Board, the Committee or an officer may permit the
         immediate exercise of any outstanding Options which are not otherwise
         exercisable.

3.5      Issue by Company of Additional Shares: Except as expressly provided in
         -------------------------------------
         this Article 3, the issue by the Company of shares of any class, or
         securities convertible into shares of any class, for money, services or
         property either upon direct sale or upon the exercise of rights or
         warrants to subscribe therefor, or upon conversion of shares or
         obligations of the Company convertible into such shares or securities,
         shall not affect, and no adjustment by reason thereof shall be made
         with respect to, the number of Shares which may be acquired on the
         exercise of any outstanding Options or the Exercise Price under such
         Options.

                                    ARTICLE 4
                                    ---------

                            MISCELLANEOUS PROVISIONS
                            ------------------------

4.1      Legal  Requirement:  The  Company  shall not be  obligated  to grant
         ------------------
         any Shares if the issuance or exercise thereof would constitute a
         violation by the Recipients or the Company of any provisions of any
         applicable valid statutory or regulatory enactment.

4.2      Rights of Recipient: The granting of Options shall not give any
         -------------------
         employee the right to be employed by the Corporation or to continue to
         be employed by the Corporation. No Recipient shall have any rights as a
         shareholder of the Company in respect of Shares issuable on the
         exercise of rights to acquire Shares under any Option until the
         allotment and issuance to the Recipient of certificates representing
         such Shares.

4.3      Amendment or Discontinuance: Subject to receipt of any necessary
         ---------------------------
         regulatory approval, the Board, the Committee or an officer may, at any
         time or from time to time, amend, suspend or terminate the Terms and
         Conditions hereof in such respects as it, in its discretion, may
         determine appropriate provided, however, that no amendment, suspension

<PAGE>

         or termination of the Terms and Conditions shall, without the consent
         of any Recipient or the representatives of his or her estate, as
         applicable, alter or impair any rights or obligations arising from any
         Option previously granted to a Recipient pursuant to the Terms and
         Conditions.

4.4      Indemnification: Every director of the Company shall at all times be
         ---------------
         indemnified and saved harmless by the Company from and against all
         costs, charges and expenses whatsoever including any income tax
         liability arising from any such indemnification, which such director
         may sustain or incur by reason of any action, suit or proceeding,
         proceeded or threatened against the director, otherwise than by the
         Company, for or in respect of any act done or omitted by the director
         in respect of these Terms and Conditions, such costs, charges and
         expenses to include any amount paid to settle such action, suit or
         proceeding or in satisfaction of any judgement rendered therein.

4.5      Effective Date: The Terms and Conditions are effective as of the date
         --------------
         of the grant of Options to the Recipient.

4.6      Governing Law: These Terms and Conditions are created under and shall
         -------------
         be governed, construed and administered in accordance with the laws of
         the Province of Ontario and the laws of Canada as applicable therein.

4.7      Currency:  All dollar amounts,  including the Exercise Price of any
         --------
         Options granted pursuant to the Terms and Conditions, are expressed in
         Canadian dollars.

<PAGE>

                                   SCHEDULE A
                                   ----------

                        THE DESCARTES SYSTEMS GROUP INC.

                       STOCK OPTION SUBSCRIPTION AGREEMENT

To:               The Chairman of The Descartes Systems Group Inc.

Date:             _________________ ____, 200__

Re:               The Descartes Systems Group Inc. Stock Options

I refer to the option granted to me on _______________ __, 200__, pursuant to
The Descartes Systems Group Inc. Terms and Conditions of Stock Option Grant
wherein I was granted an option to subscribe for and purchase fully paid and
non-assessable common shares in the capital of The Descartes Systems Group Inc.
(the "Company").

In the exercise of my rights under the said option, I hereby subscribe for
_______ fully paid and non-assessable common shares in the capital of the
Company at $_________ per share in lawful money of Canada, payment for which in
the aggregate amount of $________ accompanies this subscription.

Will you please cause such shares to be certified and registered as follows:

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

-----------------------------------------------------------

(Insert full name and address of purchaser including postal code)

and forward the relevant certificate or certificates to the registered holder at
the address shown above.

                                         Yours very truly,

                                         ------------------------------------
                                         (Signature)

                                         ------------------------------------
                                         (Name of Optionee - Please Print)

                                         ------------------------------------
                                         (Capacity - complete only if other than
                                         the Recipient (e.g. personal legal
                                         representative or trustee)

<PAGE>

                                   SCHEDULE B
                                   ----------

                        THE DESCARTES SYSTEMS GROUP INC.

                                OPTION AGREEMENT

To:               _______________________________

Date:             _________________  __, 200__

Re:               Grant of Option to Acquire Common Share in The Descartes
                  Systems Group Inc.

Attached hereto is a copy of The Descartes Systems Group Inc. Terms and
Conditions of Stock Option Grant (the "Terms and Conditions") for The Descartes
Systems Group Inc. (the "Company").

This is to advise you that you have been granted options on _________ common
shares (the "Shares") in the capital of the Company subject to this agreement
(the "Agreement") and the Terms and Conditions.

1.       The exercise price of the Shares is $________ per share.

2.       Your option may be exercised in whole or in part, subject to the
         vesting rules described below, at any time or from time to time, up to
         and including, but not after, ______________ __, 200__, on which date
         your option, unless earlier terminated by reason of your death or
         ceasing to be a Recipient (as defined in the Terms and Conditions),
         shall expire:

                             [insert vesting rules]

3.       The Terms and Conditions are hereby deemed to be incorporated into and
         to form part hereof. If there is a conflict between any provision of
         this Agreement and any provision of the Terms and Conditions, the
         relevant provision of this Agreement is to prevail.

4.       No share certificates representing such Shares shall be delivered until
         payment for the Shares has been made in full.

<PAGE>

If you desire to accept this option, please so indicate in the space below.
Please note that acceptance does not constitute an exercise of the option.
Options must be exercised in accordance with the Terms and Conditions by
completing and submitting a subscription substantially in the form of Schedule A
annexed to the Terms and Conditions, accompanied by payment in full of the
option price of the Shares in respect of which the said option is then being
exercised.

                                            THE DESCARTES SYSTEMS GROUP INC.

                                            by:_________________________________

I hereby desire to accept the above option and agree to the terms and the
conditions hereinbefore set forth including the Terms and Conditions.

------------------------------------
(Name of Recipient)

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00040-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00040-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00040-of-00352.parquet"}]]