
<PAGE>

                                                                EXHIBIT (d)(6)









                               DEED OF UNDERTAKING

                                     BETWEEN





                                      VENDOR





                                       AND





                         GE POWER SYSTEMS EQUITIES, INC.





                                SLAUGHTER AND MAY
                              35 BASINGHALL STREET
                                 LONDON EC2V 5DB
                                      CWYU




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THIS DEED is dated 17th August, 2000

BETWEEN:


(1)   [NAME OF VENDOR] (the "VENDOR"), of [VENDOR ADDRESS]; and


(2)   GE Power Systems Equities, Inc. (the "PURCHASER"), a Delaware corporation.


WHEREAS

(A)   The Purchaser proposes to make the Offer to purchase the whole of the
share capital of the Company, issued and to be issued.

(B)   The Vendor has agreed to accept the Offer in respect of the Committed
Shares.

THE PARTIES AGREE THAT:

1.    INTERPRETATION

1.1   DEFINITIONS

      In this Deed, except where the context otherwise requires:

      "ACQUISITION AGREEMENT" means the agreement of even date between Parent
      and the Company relating to the Offer;

      "ACQUISITION PROPOSAL" has the meaning given to it in the Acquisition
      Agreement;

      "BUSINESS DAY" means a day, other than a Saturday or Sunday, on which
      banks are open for ordinary banking business in London;

      "CITY CODE" means The City Code on Takeovers and Mergers;

      "COMMITTED OPTIONS" means the options to subscribe Ordinary Shares of the
      Company, particulars of which are set out in Part 2 of Schedule 1 and
      includes the Ordinary Shares and/or American Depositary Shares of the
      Company issued on exercise of such options and any Ordinary Shares and/or
      American Depositary Shares of the Company attributable to or deriving from
      such securities;

      "COMMITTED SHARES" means the Ordinary Shares and/or American Depositary
      Shares of the Company particulars of which are set out in Part 1 of
      Schedule 1 and shall include any Ordinary Shares and/or American
      Depositary Shares of the Company attributable to or deriving from such
      securities;

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                                        2


      "COMPANY" means Smallworldwide plc, a public company registered in England
      & Wales with registered number 2292791 and having its registered address
      at Elizabeth House, 1 High Street, Chesterton, Cambridge, Cambridgeshire
      CB4 1WR;

      "CONNECTED PERSON" means in relation to the Vendor any person who would be
      treated as connected with such Vendor pursuant to section 346 of the
      Companies Act 1985 if such Vendor was a director of a company incorporate
      under that Act;

      "OFFER" means the proposed offer by the Purchaser for the shares of the
      Company described in the Press Announcement;

      "OFFER PRICE" means $20 per Ordinary Share or American Depositary Share of
      the Company;

      "PARENT" means General Electric Company;

      "PRESS ANNOUNCEMENT" means the press announcement containing details of
      the Offer which the Purchaser and the Company propose to release on the
      date of this Deed, a draft of which is attached to this Deed;

      "ROLL-OVER PROPOSAL" means the proposal to be made by the Purchaser to
      holders of options to roll-over their options into options over shares
      issued by the Parent, as described in more detail in Schedule 2;

      "WARRANTIES" means the undertakings, representations, warranties,
      confirmations and other obligations set out in Clause 4.

1.2   CONSTRUCTION

      In this Deed where the context admits:-

      (A)   words and phrases the definitions of which are contained or referred
            to in Part XXVI of the Companies Act 1985 shall be construed as
            having the meanings so attributed to them;

      (B)   references to statutory provisions shall be construed as references
            to those provisions as amended or re-enacted or as their application
            is modified by other provisions from time to time and shall include
            references to any provisions of which they are re-enactments
            (whether with or without modification);

      (C)   references to Clause(s), paragraph(s) and Schedule(s) are references
            to Clause(s) and paragraphs of and Schedule(s) to this Deed and
            references to this Deed include the Schedules; and

      (D)   references to a "person" include any individual, company, body
            corporate, corporation sole or aggregate, government, state or
            agency or a state, firm, partnership, joint venture, association,
            organisation or trust (in each case,

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            whether or not having separate legal personality and irrespective of
            the jurisdiction in or under the laws of which it was incorporated
            or exists) and a reference to any of them shall include a reference
            to the others.

1.3   HEADINGS

      The headings, sub-headings, and contents pages are inserted for
      convenience only and shall not affect the construction of this Deed.

1.4   SCHEDULES

      Each of the Schedules shall have effect as if set out in this Deed.

2.    UNDERTAKING TO ACCEPT THE OFFER

2.1   The Vendor irrevocably agrees and undertakes to accept, or procure the
      acceptance of, the Offer in respect of the Committed Shares.

2.2   The Vendor further irrevocably agrees and undertakes that he will procure
      that such acceptance is not withdrawn notwithstanding that such withdrawal
      may be permitted under the terms of the Offer.

2.3   The Vendor irrevocably and by way of security for his obligations
      hereunder appoints the Purchaser and any director of the Purchaser to be
      his attorney to sign, execute and deliver on his behalf forms of
      acceptance and any other document required for a valid acceptance of the
      Offer in respect of the Committed Shares and to do all acts and things in
      his name as may be necessary for or incidental to such acceptance.

3.    UNDERTAKINGS, REPRESENTATIONS, WARRANTIES AND CONFIRMATIONS

3.1   VENDOR OBLIGATIONS

      The Vendor hereby irrevocably undertakes, represents and warrants to the
      Purchaser as follows:

      (A)   he is, or a Connected Person identified in Schedule 1 is, the
            beneficial owner and the registered holder of the Committed Shares
            and the Committed Options and the Committed Shares and the Committed
            Options are free from all encumbrances, liens and charges. Other
            than the Committed Shares and the Committed Options there are no
            shares in the Company registered in the Vendor's name (or in the
            name of any of its Connected Persons) or beneficially owned, or
            managed and controlled, by the Vendor (or any of its Connected
            Persons) or in which the Vendor (or any of its Connected Persons)
            has an interest and neither the Vendor nor any of its Connected
            Persons has any rights, warrants or options to acquire or subscribe
            for shares in the Company;

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      (B)   unless and until the Offer shall have closed, lapsed or shall have
            been withdrawn, save as referred to in this Deed or by way of
            acceptance of the Offer, the Vendor shall not and shall procure that
            its Connected Person shall not otherwise than pursuant to the Offer,
            sell or otherwise dispose of or permit the sale or other disposition
            of all or any of the Committed Shares or the Committed Options or
            any interest in any of the Committed Shares or the Committed
            Options;

      (C)   unless and until the Offer shall have closed, lapsed or shall have
            been withdrawn, save pursuant to this Deed, neither the Vendor nor
            any Connected Person of the Vendor has agreed, conditionally or
            otherwise, to dispose of all or any of the Committed Shares or the
            Committed Options or any interest therein;

      (D)   the Vendor shall not (and shall procure that its Connected Persons
            do not), without the prior written consent of the Purchaser,
            purchase or otherwise acquire any shares in the Company or any
            interest therein or agree to do so;

      (E)   the Vendor shall procure that, unless and until the Offer shall have
            closed, lapsed or shall have been withdrawn, no other agreement or
            arrangements (including any undertaking) shall be entered into
            (other than with the Purchaser) which could result in the disposal
            of, or the creation or existence of any encumbrance, lien or charge
            over on, all or any of the Committed Shares or the Committed Options
            or any interest therein or which might in any way restrict the
            disposal of the Committed Shares or the Committed Options or any of
            them and no other offer shall be accepted in respect of the
            Committed Shares or the Committed Options or any of them;

      (F)   at all times after the date hereof and until the Offer shall have
            closed, lapsed or been withdrawn, the Vendor shall comply with the
            requirements of Section 4.5(b) of the Acquisition Agreement
            applicable to the Board of Directors of the Company and with the
            requirements of Section 4.8 of the Acquisition Agreement applicable
            to a Representative of the Company (as defined in the Acquisition
            Agreement);

      (G)   so far as is consistent with his fiduciary duty as a Director,the
            Vendor will recommend acceptance of the Offer to the Company's
            shareholders; and

      (H)   the Vendor will join with the other Directors of the Company in
            making such statements of responsibility in relation to information
            relating to the Company and its subsidiaries as may be required
            under Rule 19.2 of the City Code.

3.2   BINDING OBLIGATIONS

      Each party warrants and represents to the other that it has full power and
      authority to enter into and perform its obligations under this Deed in
      accordance with the terms of this Deed and that the obligations imposed on
      it hereunder constitute legal, valid and binding obligations of it,
      enforceable against it, subject as to enforcement to laws of

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      general applicability including those relating to or affecting creditors'
      rights and to general principles of equity and public policy rules and
      regulations.

3.3   The Vendor agrees that its Connected Persons named in Schedule 1 will be
      bound by the obligations, representations and warranties on the part of
      the Vendor and the Vendor will procure compliance by such Connected
      Persons therewith.

4.    CONFIDENTIALITY

4.1   RESTRICTION

      Subject to Clause 4.2 below, the Vendor shall not make any announcement or
      public disclosure concerning this Deed or its subject matter without the
      prior written approval of the Purchaser and the Vendor will maintain
      appropriate secrecy about the possibility, and terms of, the Offer.

4.2   DISCLOSURE

      The Vendor irrevocably consents to the issue of any Offer Document (and
      any related press announcement required by Rule 2.5 of the City Code)
      incorporating references to the Vendor and to the provisions of this Deed.
      The Vendor acknowledges that this Deed may be made available for public
      inspection.

4.3   PERSISTENCE OF RESTRICTIONS

      The restrictions contained in this Clause 4 shall survive completion and
      the termination of this Deed.

5.    PROVISIONS RELATING TO THIS DEED

5.1   NO ASSIGNMENT

      This Deed shall be binding upon and inure for the benefit of the
      successors of the parties but shall not be assignable or transferable.

5.2   INVALIDITY

      If any provision of this Deed shall be held to be illegal, void, invalid
      or unenforceable under the laws of any jurisdiction, the legality,
      validity and enforceability of the remainder of this Deed in that
      jurisdiction shall not be affected, and the legality, validity and
      enforceability of the whole of this Deed shall not be effected in any
      other jurisdiction.

5.3   TIME OF THE ESSENCE

      Time shall be of the essence.

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5.4   ENTIRE AGREEMENT

      (A)   This Deed, together with any documents referred to in it,
            constitutes the whole agreement between the parties relating to its
            subject matter and supersedes and extinguishes any prior drafts,
            agreements, undertakings, representations, warranties, assurances
            and arrangements of any nature, whether in writing or oral, relating
            to such subject matter.

      (B)   Each party acknowledges that it has not been induced or enter into
            this Deed by, and that it does not in connection with this Deed or
            its subject matter rely on, any representation, warranty, promise or
            assurance by the other party or any other person other than those
            contained in this Deed and, having negotiated and freely entered
            into this Deed, agree that it shall have no remedy in respect of any
            other such representation, warranty, promise or assurance except in
            the case of fraud.

      (C)   No variation of this Deed shall be effective unless made in writing.

5.5   COUNTERPARTS

      This Deed may be executed in any number of counterparts including
      facsimile copies, which shall together constitute one Deed. Any party may
      enter into this Deed by signing any such counterpart. This Deed shall be
      of no legal effect until it has been executed by or on behalf of both
      parties.

5.6   NOTICES

      (A)   Any notice (which term shall include any other communication)
            required to be given under this Deed or in connection with the
            matters contemplated by it shall be in writing in English language.

      (B)   Any such notice shall be addressed as provided in Clause 5.6(C) and
            may be:-

            (i)   personally delivered, in which case it shall be deemed to have
                  been given upon delivery at the relevant address; or

            (ii)  if within the United Kingdom, sent by first class pre-paid
                  post, in which case it shall be deemed to have been given two
                  Business Days after the date of posting; or

            (iii) if from or to any place outside the United Kingdom, sent by
                  pre-paid priority airmail, in which case it shall be deemed to
                  have been given seven Business Days after the date of posting;
                  or

            (iv)  sent by facsimile, in which case it shall be deemed to have
                  been given when despatched subject to confirmation of
                  uninterrupted transmission by a transmission report provided
                  that any notice despatched by

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                  facsimile after 17.00 hours on any day shall be deemed to have
                  been received at 09.00 on the next Business Day.

      (C)   The addresses and other details of the parties referred to in Clause
            5.6(B) are, subject to Clause 5.6(D):-

            The Vendor

            Address:    [INSERT ADDRESS]



            Facsimile number:

            The Purchaser

            For the attention of:   General Manager, GE Energy
                                    Management Systems

            Address:                4200 Wildwood Pkwy
                                    Atlanta
                                    GA 30339

            Facsimile number:       +1 770 859 6941

            With a copy to: General Electric Company
                                    GE Power Systems
                                    4200 Wildwood Pkwy
                                    Atlanta
                                    GA 30339

                                    Facsimile number: +1 770 859 7012

                                    For the attention of: General Counsel

                                    and

                                    C.W.Y.Underhill
                                    Slaughter and May
                                    35 Basinghall Street,
                                    London EC2V 5DB
                                    Facsimile number: +44 20 7600 0289

      (D)   Any party to this Deed may notify the other parties of any change to
            the address or any of the other details specified in Clause 5.6(C),
            provided that such

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            notification shall only be effective on the date specified, in
            such notice or five Business Days after the notice is given,
            whichever is later.

5.7   ENGLISH LAW

      This Deed shall be governed by, and construed in accordance with, English
      law and the English courts shall have exclusive jurisdiction to determine
      all disputes in relation to it. The Vendor agrees that if it defaults in
      its obligations hereunder damages alone would not be an adequate remedy
      and an order for specific and no proof of special damages shall be
      necessary for the enforcement of its obligations hereunder.

5.8   PROCESS AGENT

      The Vendor appoints the Company at its registered office as its process
      agent to receive on its behalf service of process in any proceedings in
      England. Service upon the process agent shall be good service upon the
      Vendor whether or not it is forwarded to and received by the Vendor. If
      for any reason the process agent ceases to be able to act as process
      agent, or no longer has an address in England, the Vendor irrevocably
      agrees to appoint a substitute process agent with an address in England
      acceptable to the Purchaser and to deliver to the Purchaser a copy of the
      substitute process agent's acceptance of that appointment within 20
      Business Days. In the event that the Vendor fails to appoint a substitute
      process agent, it shall be effective service for the Purchaser to serve
      the process upon the last known address in England of the last known
      process agent for the Vendor notified to the Purchaser, notwithstanding
      that such process agent is not longer found at such address or has ceased
      to act.

5.9   NO OFFER

      This Deed does not and will not constitute an offer, undertaking or
      commitment of any kind by the Purchaser to purchase all or any of the
      Committed Shares.

6.    COSTS

      Each party shall pay its own costs of and incidental to this Deed and any
      resultant sale or purchase of Committed Shares or Committed Options and,
      for the avoidance of doubt, any stamp duty or stamp duty reserve tax
      payable in connection therewith shall be payable by the Purchaser.


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IN WITNESS whereof this document has been executed and delivered as a deed on
the date first before written.



SIGNED AS A DEED                    )
BY [VENDOR]                         )
in the presence of:



SIGNED AS A DEED                    )
BY GE Power Systems Equities, Inc.  )
in the presence of:



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                                   SCHEDULE 1

                                     PART 1

                              THE COMMITTED SHARES


NUMBER, CLASS AND          NAME AND ADDRESS OF         NAME AND ADDRESS OF
DENOMINATION               REGISTERED OWNER            BENEFICIAL OWNER





                                     PART 2

                              THE COMMITTED OPTIONS

NUMBER OF OPTIONS      DATE OF GRANT      NAME AND ADDRESS      NAME AND ADDRESS
                                          OF REGISTERED         OF BENEFICIAL
                                          OWNER                 OWNER






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                                   SCHEDULE 2

                               ROLL-OVER PROPOSAL

Under the Roll-over Proposal, employees and directors of the Company and its
subsidiaries who are holders ("Company Optionholders") of options ("Company
Options") over Ordinary Shares and/or American Depositary Shares (collectively,
"Shares") will be entitled to have options over shares in General Electric
Company ("GE Options") issued to them in substitution for, at the relevant
Company Optionholders' discretion, some or all of their existing Options
("Rolled-over Options"). Such GE Options will be granted on the same terms and
conditions as those applying to the Rolled-over Options. GE Options will be
granted in respect of a number of shares of common stock of General Electric
Company equal to the number of Shares the subject of the Rolled-over Options
multiplied by the Roll-over Adjustment Ratio. The exercise price per share of
common stock of General Electric Company subject to each GE Option will be the
exercise price per Share the subject of the Rolled-over Option divided by the
Roll-over Adjustment Ratio. "Roll-over Adjustment Ratio" means the amount
produced by dividing 20 by the average of the daily high and low trading prices
on the New York Stock Exchange of the common stock of General Electric Company
on each of the five successive trading days ending on the day prior to the
Purchase Date (as defined in the Acquisition Agreement).

Company Optionholders accepting the Roll-over Proposal will be paid a bonus cash
payment (the "Roll-over Bonus") equal to 10 per cent. of the value of the
Rolled-over Options (i.e. 10 per cent. of the product of the Offer Price less
the exercise price multiplied by the number of Shares the subject of the
Rolled-over Options); one half of the Roll-over Bonus will be payable 90 days
after acceptance by the relevant Company Optionholder of the Roll-over Proposal,
with the balance being payable 270 days after acceptance by the relevant Company
Optionholder of the Roll-over Proposal, conditional, in each case (except for
non-executive directors), on the relevant Company Optionholder not then having
terminated his employment.

GE Options granted pursuant to the Rollover Proposal in respect of Company
Options granted subject to a condition that the share price of Company Shares is
not less than $24 will vest in three equal tranches, on the first, second and
third anniversaries of the date of grant.
