Document:

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                                                                   EXHIBIT 10.18

                                  AMENDMENT TO
                            THE EMPLOYMENT AGREEMENT

                  This Amendment to the Employment Agreement (this "Amendment"),
effective as of December 11, 2001, is made by and between Penton Media, Inc., a
Delaware corporation (the "Company") and Darrell Denny (the "Executive"), in
order to amend the Employment Agreement made as of October 15, 2000 (the
"Agreement").

                  NOW THEREFORE, the undersigned parties hereby amend the
Agreement as follows:

1.       Paragraph 3 of the Agreement is hereby amended to add the following new
         paragraph 3(j) at the end thereof:

         "(j) 2001 LIFE INSURANCE BENEFITS. The Company shall use its best
         efforts to purchase (as soon as reasonably practicable after December
         1, 2001) and maintain in effect until the first date (the "Payoff
         Date") that there is no amount due from Executive to the Company under
         any Promissory Note in effect on December 11, 2001 issued by Executive
         to the Company (the "Note"), additional term life insurance coverage in
         an amount equal to at least $270,000. If the Company is unable to
         procure or maintain such life insurance on behalf of Executive, it
         shall provide, from its own funds, a lump sum death benefit equal to
         the term life insurance coverage amount provided for in the preceding
         sentence, which shall be payable to Executive's designated beneficiary
         or beneficiaries in the event of Executive's death prior to the Payoff
         Date."

2.       Paragraph 3 of the Agreement is hereby amended to add the following new
         paragraph 3(k) at the end thereof:

         "(k) 2001 DISABILITY BENEFITS. The Company shall use its best efforts
         to purchase (as soon as reasonably practicable after December 1, 2001)
         and maintain in effect until the Payoff Date, supplementary long-term
         disability coverage in an amount equal to at least $270,000. If the
         Company is unable to procure or maintain such supplementary long-term
         disability coverage on behalf of Executive, it shall provide, from its
         own funds, a lump sum disability benefit equal to the long-term
         disability insurance coverage amount provided for in the preceding
         sentence, which shall be payable to Executive in the event of
         Executive's disability prior to the Payoff Date."

3.       Paragraph 3 of the Agreement is hereby amended to add the following new
         paragraph 3(l) at the end thereof:

         "(l)     ADDITIONAL 2001 BENEFITS.

                  (i)      The Company shall pay to Executive each year,
                           regardless of whether this Agreement has been
                           terminated, a payment (the "(l)(i) Gross Up Payment")
                           in an amount equal to the total of all income taxes
                           imposed on

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                           Executive as a result of (A) the Company's
                           provision of life and disability insurance coverage
                           as set forth in the first sentence of each of
                           paragraphs 3(j) and 3(k) above; (B) imputed income to
                           Executive with respect to the Notes; and (C) the
                           (l)(i) Gross Up Payment; and

                  (ii)     The Company shall pay to Executive, regardless of
                           whether this Agreement has been terminated, a payment
                           (the "(l)(ii) Gross Up Payment") in an amount equal
                           to the total of all income taxes imposed on Executive
                           as a result of (A)(i) the issuance of the Deferred
                           Shares to Executive on an accelerated basis following
                           a Change of Control, a Termination without Cause, a
                           Termination by Executive for Good Reason, Executive's
                           involuntary Retirement, or the death or disability of
                           Executive or (ii) any other issuance of the Deferred
                           Shares to Executive, if a Change of Control occurs
                           prior to the payment in full of the Notes; and (B)
                           the (l)(ii) Gross Up Payment.

                  (iii)    In the event that the excise tax under Section 4999
                           of the Internal Revenue Code applies to the issuance
                           of the Deferred Shares to the Executive or the
                           (l)(ii) Gross Up Payment, and if the sum of (A) the
                           value of the Deferred Shares at the time of such
                           Change of Control, reduced by such excise tax, plus
                           (B) the value of the Purchased Shares at the time of
                           such Change of Control, plus (C) the proceeds of any
                           life insurance or disability insurance (or Company
                           provided death benefit or disability benefit)
                           described in paragraphs 3(j) and 3(k) above received
                           by or with respect to the Executive at the time of or
                           before such Change of Control (the sum of (A), (B)
                           and (C) being referred to as the "Loan Payments") is
                           less than the amount due and owing by the Executive
                           under the Note at the time of the Change of Control
                           (the "Change of Control Loan Balance"), then the
                           Company shall make an additional payment to the
                           Executive equal to the sum of (i) the lesser of (X)
                           the difference between the Change of Control Loan
                           Balance and the Loan Payments or (Y) 20% of the sum
                           of the value of the Deferred Shares at the time of
                           such Change of Control plus the (l)(ii) Gross Up
                           Payment (the "Initial Additional Payment") plus (ii)
                           an amount (the "(l)(iii) Gross Up Payment") such
                           that, after payment by the Executive of all taxes
                           (including the excise tax under Section 4999 of the
                           Internal Revenue Code) imposed upon the (l)(iii)
                           Gross Up Payment, the Executive retains an amount of
                           the (l)(iii) Gross Up Payment equal to the excise tax
                           under Section 4999 of the Internal Revenue Code
                           imposed upon the Initial Additional Payment.

                  (iv)     The amount of the (l)(i) Gross Up Payment, the
                           (l)(ii) Gross Up Payment and the (l)(iii) Gross Up
                           Payment, each shall be calculated by the Company's
                           independent auditors at the time that such
                           calculation is necessary. The Executive shall provide
                           such information as is reasonably necessary in
                           connection with any such calculation."

                                       2
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4.       Except as expressly set forth in this Amendment, the Agreement remains
         unchanged and continues in full force and effect.

                  IN WITNESS WHEREOF, the undersigned have executed this
Amendment on this __ day of December, 2001, effective as of December 11, 2001.

                                             PENTON MEDIA, INC.

                                             By:
                                                --------------------------------
                                             Thomas L. Kemp
                                             Chief Executive Officer

                                             -----------------------------------
                                             Executive

                                       3<PAGE>
                                                                    Exhibit 4.1

PREFERRED SHARES                                                PREFERRED SHARES
    NUMBER                                                            SHARES

----------------                                                ----------------
     PB
----------------                                                ----------------

                  DEVELOPERS DIVERSIFIED REALTY CORPORATION

 THIS CERTIFICATE IS TRANSFERABLE IN                           CUSIP 251591 86 3
      CLEVELAND, OH                                         SEE REVERSE SIDE FOR
                                                             CERTAIN DEFINITIONS

THIS CERTIFIES THAT

IS THE OWNER OF

FULLY PAID AND NONASSESSABLE 8.60% CLASS F CUMULATIVE REDEEMABLE PREFERRED
SHARES, WITHOUT PAR VALUE, ($250.00 LIQUIDATION PERFERENCE PER SHARE) OF

Developers Diversified Realty Corporation transferable on the books of the
Corporation by the holder hereof in person or by duly authorized attorney upon
surrender of this certificate properly endorsed.  This certificate and the
shares represented hereby are issued and shall be held subject to all the
provisions of the Articles of Incorporation and amendments thereto as filed in
the office of the Secretary of State of Ohio, to which the holder by acceptance
hereof, assents.  This certificate is not valid unless countersigned and
registered by the Transfer Agent and Registrar.

        In Witness Whereof, the Corporation has caused this certificate to be
executed by the facsimile signatures of its duly authorized officers.

COUNTERSIGNED AND REGISTERED:
           NATIONAL CITY BANK
               TRANSFER AGENT AND REGISTRAR

BY:                                 /s/ Joan U. Allgood   /s/ Scott A. Wolstein
                 AUTHORIZED SIGNATURE         SECRETARY              PRESIDENT

                             CERTIFICATE OF STOCK
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                  DEVELOPERS DIVERSIFIED REALTY CORPORATION

        The Preferred Shares represented by this certificate are subject to
restrictions on transfer for the purpose of the Corporation's maintenance of its
status as a Real Estate Investment Trust under the Internal Revenue Code of
1986, as amended.  Subject to certain provisions of the Corporation's Amended
and Restated Articles of Incorporation, as amended, no Person may Beneficially
Own or Constructively Own shares of any series of any class of Preferred Shares
in excess of 9.8% of the outstanding Preferred Shares of such series. Any
Person who attempts to Beneficially Own or Constructively Own shares of any
series of any class of Preferred Shares in excess of the above limitations
must immediately notify the Corporation. All capitalized terms in this legend
have the meanings defined in the Corporation's Amended and Restated Articles of
Incorporation, as amended, a copy of which, including the restrictions on
transfer, will be sent without charge to each shareholder who so requests.  If
the restrictions on transfer are violated, certain of the Preferred Shares
represented hereby may be subject to repurchase by the Corporation on the terms
and conditions set forth in the Corporation's Amended and Restated Articles of
Incorporation, as amended.

        The following abbreviations when used in the instructions on the face
of this Certificate shall be construed as though they were written out in full
according to applicable laws or regulations.

<Table>
<S>                                          <C>
TEN COM --as tenants in common               UNIF GIFT MIN ACT--__________Custodian__________
TEN ENT --as tenants by the entireties                           (Cust)             (Minor)
JT TEN  --as joint tenants with right of                    under Uniform Gifts to Minors
          survivorship and not as tenants                   Act_____________________
          in common
</Table>
    Additional abbreviations may also be used though not in the above list.

                                  ASSIGNMENT

        For value received,______________________________________________ hereby
sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE
---------------------------------------

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

________________________________________________________________________________

________________________________________________________________________________

_______________________________________________________________ Preferred Shares
represented by the within Certificate, and do hereby irrevocably constitute and
appoint

_______________________________________________________________________ Attorney
to transfer the said Preferred Shares on the books of the within named
Corporation with full power of substitution in the premises.

Dated:__________________________________

________________________________________________________________________________
NOTICE: The signature to the assignment must correspond with the name as written
upon the face of this Receipt in every particular, without alteration or
enlargement or any change whatever.

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