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                                                                   EXHIBIT 10.16
                       INTERNATIONAL TOTAL SERVICES, INC.
                     NON-EMPLOYEE DIRECTOR COMPENSATION PLAN

         This International Total Services, Inc. Non-Employee Director
Compensation Plan ("Plan") was adopted by the Compensation Committee of the
Board on January 5, 2000.

                                    ARTICLE I
                                   DEFINITIONS

         1.1 "Board" means the Company's Board of Directors.

         1.2 "Change in Control" means the first to occur of the following
events (i) any person or group of commonly controlled persons, other than the
voting trust established and maintained pursuant to the Voting Trust Agreement
made and entered into as of November 1, 1998 by and among the Corporation,
Robert A. Weitzel, H. Jeffrey Schwartz, John P. O'Brien and J. Jeffrey Eakin
(the "Voting Trust"), acquire ownership or control, directly or indirectly, of
more than twenty percent (20%) of the voting control or value of the equity
interests in the Corporation excluding from this clause (i), however, a transfer
of voting control to Robert A. Weitzel resulting solely and directly from the
termination of the Voting Trust pursuant to its terms; (ii) the shareholders of
the Corporation approve an agreement to merge or consolidate with another
corporation or other entity resulting (whether separately or in connection with
a series of transactions) in a change in ownership of twenty percent (20%) or
more of the voting control or value of the equity interests in the Corporation,
or an agreement to sell or otherwise dispose of all or substantially all of the
Corporation's assets (including, without limitation, a plan of liquidation or
dissolution), or otherwise approve of a fundamental alteration in the nature of
the Corporation's business; or (iii) at any time during any period of
twenty-four (24) consecutive months, individuals who were directors at the
beginning of the 24-month period no longer constitute a majority of the members
of the Board of Directors of the Corporation, unless the election, or the
nomination for election by the Corporation's shareholders, of each director who
was not a director at the beginning of the period is approved by at least a
majority of the directors who (x) are in office at the time of the election or
nomination and (y) were directors at the beginning of the period.

         1.3 "Closing Price" means the closing price of a share of the Company's
common stock on a national securities exchange or inter-dealer quotation system
on the last business day prior to the date on which the value is determined, as
reported in the Wall Street Journal or such other source of quotations for or
report of trading of such shares as the Compensation Committee of the Board may
select from time to time; provided, however, that if such shares are not traded
on such an exchange, or inter-dealer quotation system, Closing Price means the
mean between the high and the low bid and asked prices (to the extent such
information is available) for such shares on the over-the-counter market on the
last business day prior to the date on which value is determined (or the next
preceding day on which sales occurred if there were no sales on such date). In
the event of a Change in Control, the Closing Price shall be determined pursuant
to the foregoing or as is otherwise determined in good faith by the Compensation
Committee of the Board.

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         1.4 "Company" means International Total Services, Inc., an Ohio
corporation.

         1.5 "Director Fees" means the fees that would otherwise be paid to the
Eligible Director for service on the Board and/or any of its committees,
including any annual fees and meeting fees.

         1.6 "Eligible Director" means a non-employee director on the Board on
or after January 1, 2000.

         1.7 "Phantom Share" means an economic interest that is equivalent in
value to the value of one share of the Company's common stock.

         1.8 "Share Price Target" means for any vesting percentage on the
Schedule in Section 2.1(b) that the Closing Price on each of the trading days
(determined without regard to whether any trades are actually made) during
twenty (20) consecutive trading days equals or exceeds the relevant Share Price
Target amount listed opposite such percentage on such Schedule.

                                   ARTICLE II
                               PHANTOM SHARE AWARD

         2.1 AWARD. Each person who is an Eligible Director on January 5, 2000
shall receive an award of 50,000 Phantom Shares.

         2.2 VESTING.

             (a) 20% of the Phantom Shares awarded to an Eligible Director
         under Section 2.1 shall be immediately fully vested and nonforfeitable.

             (b) The remaining Phantom Shares awarded to an Eligible
         Director under Section 2.1 that are not vested under Section 2.2(a)
         shall vest upon the attainment of Share Price Targets as follows:

                       Additional Vesting
           (expressed as a percentage of the total Award)     Share Price Target
           ----------------------------------------------     ------------------

                        10%                                           $  2.00
                        10%                                           $  3.00
                        10%                                           $  4.00
                        10%                                           $  5.00
                        10%                                           $  6.00
                        10%                                           $  8.00
                        10%                                            $10.00
                        10%                                            $12.00

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             (c) Notwithstanding Section 2.2(b) all Phantom Shares Awarded
         under Section 2.1 shall immediately become fully vested and
         nonforfeitable in the event of a Change in Control.

         2.3 DISTRIBUTION. The Company shall pay a person receiving an award
under Section 2.1 an amount, in cash, equal to the number of the Person's vested
Phantom Shares multiplied by the Closing Price measured on the first to occur of
the following dates (the "Article II Measurement Date"): (a) the date the award
becomes fully vested; or (b) the date the director ceases to be a Board member.
Actual payment under the preceding sentence shall be made as soon as
practicable, but in no event more than ten (10) business days after the person's
Article II Measurement Date.

                                   ARTICLE III
                              DIRECTOR FEE DEFERRAL

         3.1 DEFERRAL. Each Eligible Director may at any time prospectively
elect to have all or some portion of the Director Fees that would otherwise be
paid to the Director for future service be deferred under this Plan. Amounts
deferred under the preceding sentence shall be converted into Phantom Shares in
a manner such that the number of Phantom Shares awarded equals one hundred
twenty percent (120%) of the fee so deferred, based upon the Closing Price on
the date the fee would otherwise be paid to the Eligible Director.

         3.2 VESTING. The Phantom Shares awarded under Section 3.1 shall be
fully vested and nonforfeitable at all times.

         3.3 DISTRIBUTION. The Company shall pay a person awarded Phantom Shares
pursuant to Section 3.1 an amount, in cash, equal to the number of such Phantom
Shares multiplied by the Closing price on the first to occur of the following
dates (the "Article III Measurement Date"): (a) the date the director ceases to
be a Board member; (b) the date of a Change in Control; or (c) the date
specified in the deferral election form making the deferral under Section 3.1,
provided such date is at least one year following the date the Director Fee
would otherwise be paid to the Eligible Director. Actual payment under the
preceding sentence shall be made as soon as practicable, but in no event more
than ten (10) business days after the person's Article III Measurement Date.

                                   ARTICLE IV
                                  MISCELLANEOUS

         4.1 AMENDMENT AND TERMINATION. The Board, in its sole discretion, may
amend or terminate this Plan at any time; provided, however, that any amendment
or termination that could adversely affect an Eligible Director's rights and
interests hereunder (other than to the right to continued deferral under Article
III) will be effective as to such Eligible Director only if he consents in
writing to the amendment or termination.

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         4.2 NO BENEFICIAL INTEREST OR FUNDING. No person or entity shall
acquire any beneficial interest in an amount under this Plan prior to the date
on which the amount becomes payable. The amounts payable hereunder shall not be
funded in any way and, prior to payment, the rights of an Eligible Director
hereunder shall be no greater than that of a general creditor of the Company.

         4.3 ADJUSTMENTS UPON CHANGES IN CAPITALIZATION. In the event of changes
in the outstanding shares of Company stock by reason of stock dividends, stock
splits, reclassifications, recapitalizations, mergers, consolidations,
combinations, exchanges of shares, separations, reorganizations, liquidation or
similar events or in the event of extraordinary non-cash dividends or
distributions being declared with respect to such shares or similar transactions
or events, the number and class or Phantom Shares hereunder shall be equitably
adjusted by the Compensation Committee of the Board.

         4.4 GOVERNING LAW. This Plan shall be governed and construed in
accordance with the laws of the State of Ohio, without giving effect to
principles of conflicts of laws thereof.<PAGE>   1
                                                                     Exhibit 4.2

                           CERTIFICATE OF AMENDMENT OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                                   VERIO INC.

         VERIO 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 at a meeting of the Board of Directors of VERIO INC. (the
"Corporation"), duly held on February 17, 2000, resolutions were duly adopted
setting forth a proposed amendment of the Certificate of Incorporation of said
Corporation, declaring said amendment to be advisable. The resolution setting
forth the proposed amendment is as follows:

         RESOLVED, that the Certificate of Incorporation of this Corporation be,
and it hereby is, amended by deleting the first paragraph of Article Four
thereof and replacing it with the following:

                                  "ARTICLE FOUR

                                1. CAPITAL STOCK

         The total number of shares of all classes of stock that the Corporation
is authorized to issue is seven hundred seventy million (770,000,000) shares,
consisting of seven hundred fifty million (750,000,000) shares of Common Stock,
par value $.001 per share, and twenty million (20,000,000) shares of Preferred
Stock, par value $.001 per share."

         SECOND: That thereafter, the 2000 Annual Meeting of Stockholders of
said Corporation was duly called and held, upon notice in accordance with
Sections 211 and 222 of the General Corporation Law of the State of Delaware, at
which meeting the necessary number of shares as required by statute was voted in
favor of the amendment.

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

         FOURTH: That the capital of said Corporation shall not be reduced under
or by reason of said amendment.

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         IN WITNESS WHEREOF, the undersigned, being the Chief Executive Officer
of the Corporation, for the purpose of amending the Certificate of Incorporation
of the Corporation pursuant to Section 242 of the General Corporation Law of the
State of Delaware, does make and file this Certificate, hereby declaring and
certifying that the facts herein stated are true, and accordingly has hereunto
set my hand this 28th day of April, 2000.

                                       VERIO INC.

                                       By: /s/ Justin L. Jaschke
                                          -----------------------
                                          Justin L. Jaschke
                                          Chief Executive Officer

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