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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>UNITED
      STATES</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SECURITIES
      AND EXCHANGE COMMISSION</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>WASHINGTON,
      D.C. 20549</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>______________</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>FORM
      8-K</u></strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>CURRENT
      REPORT</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>PURSUANT
      TO SECTION 13 OR 15(d) OF THE</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SECURITIES
      EXCHANGE ACT OF 1934</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date
      of
      Report (Date of earliest event reported): </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>August
      31, 2006</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>HILL
      INTERNATIONAL, INC.</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
      Name of Registrant as Specified in Charter)</font></div>
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            </td>
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                or Other Jurisdiction</font></div>
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                Incorporation)</font></div>
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                </font></div>
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                Number)</font></div>
            </td>
            <td valign="top" width="2%">&#160;</td>
            <td valign="top" width="32%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(IRS
                Employer </font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Identification
                No.)</font></div>
            </td>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">303
                Lippincott Centre, Marlton, NJ</font></div>
            </td>
            <td valign="top" width="30%">&#160;</td>
            <td valign="top" width="20%" style="border-bottom: black thin solid;">
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            </td>
          </tr>
          <tr>
            <td valign="top" width="50%">
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                of Principal Executive Offices)</font></div>
            </td>
            <td valign="top" width="30%">&#160;</td>
            <td valign="top" width="20%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Zip
                Code)</font></div>
            </td>
          </tr>

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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Registrant&#8217;s
      telephone number, including area code:</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>(856)
      810-6200</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Arpeggio
      Acquisition Corporation</u></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Former
      Name or Former Address, if Changed Since Last Report)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions (see General Instruction A.2. below):</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 36.8pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)</font></div>
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      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 45pt; TEXT-INDENT: -45pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 36.8pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 45pt; TEXT-INDENT: -45pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">&#168;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 36.8pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))</font></div>
    <div>&#160;</div>
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      </div>
      <div id="HDR">
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      </div>
    </div>
    <div>&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      2.01 Completion of Acquisition or Disposition of Assets</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">August
      31</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">,
      2006,
      Hill International SA, a wholly-owned subsidiary of Hill International, Inc.
      (the &#8220;Registrant&#8221;) acquired approximately 96.5% of the outstanding shares of
      James R. Knowles (Holdings) PLC (&#8220;Knowles&#8221;) for a price of 33 pence (or
      approximately $0.62 at the exchange rate current as of the date of this report)
      per share in cash. The consideration paid by Hill International SA for 96.5%
      of
      the outstanding shares of Knowles was approximately $12.8 million. Under
      applicable law, Hill International SA is entitled to compulsorily acquire the
      remaining 3.5% of the outstanding shares of Knowles at the same purchase price
      per share. Hill International SA intends to acquire those shares at such
      purchase price.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Knowles
      is a construction and engineering industry claims consulting and dispute
      resolution company with 36 offices worldwide, headquartered in Daresbury, United
      Kingdom. For its fiscal year ended July 31, 2005, Knowles recorded revenues
      of
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#163;30.2
      million </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(or
      approximately $57.16 million at the exchange rate current as of the date of
      this
      report) and profit on ordinary activities before taxation of </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#163;41,000</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      (or
      approximately $77,605 at the exchange rate current as of the date of this
      report). </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      July
      20, 2006, Hill International SA, the Registrant and Knowles entered into
      agreements with Knowles shareholders owning, in the aggregate, approximately
      80.1% of the outstanding shares of Knowles, which agreements provided that
      such
      shareholders would sell all of their Knowles shares to Hill International SA.
      These agreements were attached as exhibits to our Current Report on Form 8-K
      filed with the SEC on July 26, 2006. Shareholders owning approximately 16.4%
      of
      the outstanding shares of Knowles agreed to sell their shares to Hill
      International SA pursuant to a cash tender offer.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Knowles
      is party to separate employment contracts with each of Brian S. Quinn, the
      Chief
      Executive Officer of Knowles, and Charlotte L. Parsons, the Group Finance
      Director of Knowles. The agreement with Mr. Quinn provides for a base salary
      of
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#163;250,000</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      (or
      approximately $473,200 at the exchange rate current as of the date of this
      report), as well as for a car allowance, performance based compensation upon
      the
      achievement of certain performance criteria, and other terms and conditions
      customary for agreements of its kind. The agreement with Mr. Quinn is terminable
      by either party upon three months&#8217; notice and with a termination payment of
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#163;130,000</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      (or
      approximately $246,064 at the exchange rate current as of the date of this
      report). The agreement with Ms. Parsons provides for a base salary of
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#163;115,000</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      (or
      approximately $217,672 at the exchange rate current as of the date of this
      report), as well as for participation in a discretionary bonus program, a car
      allowance and other terms and conditions customary for agreements of its kind.
      The agreement with Ms. Parsons is terminable by either party upon 12 months&#8217;
notice. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Knowles
      is party to a service contract with Wynton Services Limited and J. Roger
      Knowles, the former executive chairman and a former director of Knowles. The
      agreement provides that Knowles shall pay Wynton Services Limited a fee of
      </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#163;175,000
      per annum </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(or
      approximately $331,240 at the exchange rate current as of the date of this
      report) less the amount of certain benefits received by Mr. Knowles or Wynton
      Services Limited. The service contract terminates on September 29, 2006. Mr.
      Knowles resigned as an officer and director of Knowles, effective at the time
      of
      Hill International SA&#8217;s acquisition of 96.5% of the outstanding shares of
      Knowles. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      9.01 Financial Statements and Exhibits.</strong></font></div>
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    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 36pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(a)</font></div>
            </td>
            <td>
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Financial
                statements of business acquired</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">.
                Audited financial statements for Knowles required pursuant to Regulation
                S-X will be furnished by an amendment to this Form 8-K within 71
                calendar
                days after the date this report was required to have been
                filed.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 36pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)</font></div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Pro
                forma financial information</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">.
                Any pro forma financial information required pursuant to Regulation
                S-X
                will be furnished by an amendment to this Form 8-K within 71 calendar
                days
                after the date this report was required to have been
                filed.</font></div>
            </td>
          </tr>

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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 36pt;">
              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(c)</font></div>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Shell
                Company Transactions</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">.
                None.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div>
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          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">&#160;</td>
            <td style="width: 36pt;">
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            </td>
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              <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Exhibits</u></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">.</font></div>
            </td>
          </tr>

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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
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      <table border="1" bordercolor="black" cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td align="left" valign="top" width="14%" style="border-bottom: medium none;">
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                No.</u></font></div>
            </td>
            <td align="left" valign="top" width="57%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Description</u></font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.1</font></div>
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                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst &amp; Young LLP from Active Capital Trust
                PLC (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.1 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
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          <tr>
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            </td>
            <td align="left" valign="top" width="57%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Director&#8217;s
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst &amp; Young LLP from Lord Lee of
                Trafford (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.2 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="14%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.3</font></div>
            </td>
            <td align="left" valign="top" width="57%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst &amp; Young LLP from Michael Conrad Charlton
                (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.3 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="14%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.4</font></div>
            </td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Director&#8217;s
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst &amp; Young LLP from Peter Bates (filed
                </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.4 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>

      </table>
    </div>
    <div>&#160;</div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">&#160;</div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">&#160;</div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
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      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">&#160;</div>
      </div>
    </div>
    <div>&#160;</div>
    <div>
      <table border="1" bordercolor="black" cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td valign="top" width="14%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.5</font></div>
            </td>
            <td align="left" valign="top" width="57%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst &amp; Young LLP from White Rose Nominees
                Limited (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.5 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="14%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.6</font></div>
            </td>
            <td align="left" valign="top" width="57%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Director&#8217;s
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst &amp; Young LLP from Roger Knowles
                (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.6 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="14%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.7</font></div>
            </td>
            <td align="left" valign="top" width="57%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Director&#8217;s
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst &amp; Young LLP from Wendy Knowles
                (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.7 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
          </tr>
          <tr>
            <td valign="top" width="14%" style="border-bottom: medium none;">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.8</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst &amp; Young LLP from Wynton Services Limited
                (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.8 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
            </td>
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          <tr>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.9</font></div>
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                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst &amp; Young LLP from Brian Stephen
                Quinn (filed </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">as
                exhibit 10.9 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">).</font></div>
            </td>
          </tr>

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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">&#160;</div>
      </div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">&#160;</div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SIGNATURES</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the requirements of the Securities Exchange Act of 1934, the registrant
      has
      duly caused this report to be signed on its behalf by the undersigned hereunto
      duly authorized.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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            <td valign="bottom" width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><br></font>
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                September 5, 2006</font></div>
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            <td width="50%">
              <div><font size="2">HILL INTERNATIONAL, INC. </font></div>
              <div>&#160;</div>
              <div>&#160;</div>
              <div>&#160;</div>
              <div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:
                  /s/ Irvin E. Richter</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Name:
                  Irvin E. Richter</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Title:
                  Chairman and Chief Executive
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{"company-data": {"conformed-name": "Hill International, Inc.", "cik": "0001287808", "assigned-sic": "8711", "irs-number": "200953973", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-50781", "film-number": "061077335"}, "business-address": {"street1": "303 LIPPINCOTT CENTRE", "city": "MARLTON", "state": "NJ", "zip": "08053", "phone": "(856) 810-6200"}, "mail-address": {"street1": "303 LIPPINCOTT CENTRE", "city": "MARLTON", "state": "NJ", "zip": "08053"}, "former-company": {"former-conformed-name": "ARPEGGIO ACQUISITION CORP", "date-changed": "20040420"}}
UNITED
      STATES
SECURITIES
      AND EXCHANGE COMMISSION
WASHINGTON,
      D.C. 20549
______________
FORM
      8-K
CURRENT
      REPORT
PURSUANT
      TO SECTION 13 OR 15(d) OF THE
SECURITIES
      EXCHANGE ACT OF 1934
Date
      of
      Report (Date of earliest event reported):
August
      31, 2006
HILL
      INTERNATIONAL, INC.
(Exact
      Name of Registrant as Specified in Charter)
Delaware
000-50781
20-0953973
(State
                or Other Jurisdiction
of
                Incorporation)
(Commission
File
                Number)
(IRS
                Employer
Identification
                No.)
303
                Lippincott Centre, Marlton, NJ
08053
(Address
                of Principal Executive Offices)
(Zip
                Code)
Registrant's
      telephone number, including area code:
(856)
      810-6200
Arpeggio
      Acquisition Corporation
(Former
      Name or Former Address, if Changed Since Last Report)
Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions (see General Instruction A.2. below):
¨
Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
¨
Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)
¨
Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))
¨
Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))
Item
      2.01 Completion of Acquisition or Disposition of Assets
On
August
      31
,
      2006,
      Hill International SA, a wholly-owned subsidiary of Hill International, Inc.
      (the "Registrant") acquired approximately 96.5% of the outstanding shares of
      James R. Knowles (Holdings) PLC ("Knowles") for a price of 33 pence (or
      approximately $0.62 at the exchange rate current as of the date of this report)
      per share in cash. The consideration paid by Hill International SA for 96.5%
      of
      the outstanding shares of Knowles was approximately $12.8 million. Under
      applicable law, Hill International SA is entitled to compulsorily acquire the
      remaining 3.5% of the outstanding shares of Knowles at the same purchase price
      per share. Hill International SA intends to acquire those shares at such
      purchase price.
Knowles
      is a construction and engineering industry claims consulting and dispute
      resolution company with 36 offices worldwide, headquartered in Daresbury, United
      Kingdom. For its fiscal year ended July 31, 2005, Knowles recorded revenues
      of
£30.2
      million
(or
      approximately $57.16 million at the exchange rate current as of the date of
      this
      report) and profit on ordinary activities before taxation of
£41,000
(or
      approximately $77,605 at the exchange rate current as of the date of this
      report).
On
      July
      20, 2006, Hill International SA, the Registrant and Knowles entered into
      agreements with Knowles shareholders owning, in the aggregate, approximately
      80.1% of the outstanding shares of Knowles, which agreements provided that
      such
      shareholders would sell all of their Knowles shares to Hill International SA.
      These agreements were attached as exhibits to our Current Report on Form 8-K
      filed with the SEC on July 26, 2006. Shareholders owning approximately 16.4%
      of
      the outstanding shares of Knowles agreed to sell their shares to Hill
      International SA pursuant to a cash tender offer.
Knowles
      is party to separate employment contracts with each of Brian S. Quinn, the
      Chief
      Executive Officer of Knowles, and Charlotte L. Parsons, the Group Finance
      Director of Knowles. The agreement with Mr. Quinn provides for a base salary
      of
£250,000
(or
      approximately $473,200 at the exchange rate current as of the date of this
      report), as well as for a car allowance, performance based compensation upon
      the
      achievement of certain performance criteria, and other terms and conditions
      customary for agreements of its kind. The agreement with Mr. Quinn is terminable
      by either party upon three months' notice and with a termination payment of
£130,000
(or
      approximately $246,064 at the exchange rate current as of the date of this
      report). The agreement with Ms. Parsons provides for a base salary of
£115,000
(or
      approximately $217,672 at the exchange rate current as of the date of this
      report), as well as for participation in a discretionary bonus program, a car
      allowance and other terms and conditions customary for agreements of its kind.
      The agreement with Ms. Parsons is terminable by either party upon 12 months'
notice.
Knowles
      is party to a service contract with Wynton Services Limited and J. Roger
      Knowles, the former executive chairman and a former director of Knowles. The
      agreement provides that Knowles shall pay Wynton Services Limited a fee of
£175,000
      per annum
(or
      approximately $331,240 at the exchange rate current as of the date of this
      report) less the amount of certain benefits received by Mr. Knowles or Wynton
      Services Limited. The service contract terminates on September 29, 2006. Mr.
      Knowles resigned as an officer and director of Knowles, effective at the time
      of
      Hill International SA's acquisition of 96.5% of the outstanding shares of
      Knowles.
Item
      9.01 Financial Statements and Exhibits.
(a)
Financial
                statements of business acquired
.
                Audited financial statements for Knowles required pursuant to Regulation
                S-X will be furnished by an amendment to this Form 8-K within 71
                calendar
                days after the date this report was required to have been
                filed.
(b)
Pro
                forma financial information
.
                Any pro forma financial information required pursuant to Regulation
                S-X
                will be furnished by an amendment to this Form 8-K within 71 calendar
                days
                after the date this report was required to have been
                filed.
(c)
Shell
                Company Transactions
.
                None.
(d)
Exhibits
.
Exhibit
                No.
Description
10.1
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from Active Capital Trust
                PLC (filed
as
                exhibit 10.1 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.2
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Lord Lee of
                Trafford (filed
as
                exhibit 10.2 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.3
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from Michael Conrad Charlton
                (filed
as
                exhibit 10.3 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.4
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Peter Bates (filed
as
                exhibit 10.4 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.5
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from White Rose Nominees
                Limited (filed
as
                exhibit 10.5 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.6
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Roger Knowles
                (filed
as
                exhibit 10.6 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.7
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Wendy Knowles
                (filed
as
                exhibit 10.7 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.8
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from Wynton Services Limited
                (filed
as
                exhibit 10.8 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
10.9
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Brian Stephen
                Quinn (filed
as
                exhibit 10.9 to our Current Report on Form 8-K filed with the SEC
                on July
                26, 2006 and incorporated herein by reference
).
SIGNATURES
Pursuant
      to the requirements of the Securities Exchange Act of 1934, the registrant
      has
      duly caused this report to be signed on its behalf by the undersigned hereunto
      duly authorized.
Dated:
                September 5, 2006
HILL INTERNATIONAL, INC.
By:
                  /s/ Irvin E. Richter
Name:
                  Irvin E. Richter
Title:
                  Chairman and Chief Executive
                  Officer