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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#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>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">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">
      <div>
        <hr style="COLOR: black" align="center" noshade size="1" width="15%">
      </div>
    </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>FORM
      8-K</strong></font>&#160;</div>
    <div>
      <hr style="COLOR: black" align="center" noshade size="1" width="15%">
    </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): July 20, 2006</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"><strong><u>HILL
      INTERNATIONAL, INC. </u></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">(Exact
      Name of Registrant as Specified in Charter<u>)</u></font></div>
    <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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            <td valign="top" width="33%" 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"><u>Delaware</u></font></div>
            </td>
            <td align="left" valign="top" width="1%" style="border-bottom: medium none;">&#160;</td>
            <td align="left" valign="top" width="32%" 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"><u>000-50781</u></font></div>
            </td>
            <td align="left" valign="top" width="1%" style="border-bottom: medium none;">&#160;</td>
            <td align="left" valign="top" width="33%" 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"><u>20-0953973</u></font></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">(State
                or Other Jurisdiction</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">of
                Incorporation)</font></div>
            </td>
            <td align="left" valign="top" width="1%" style="border-bottom: medium none;">&#160;</td>
            <td align="left" valign="top" width="32%" 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">(Commission
                </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">File
                Number)</font></div>
            </td>
            <td align="left" valign="top" width="1%" style="border-bottom: medium none;">&#160;</td>
            <td align="left" valign="top" width="33%" 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">(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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          <tr>
            <td align="left" valign="top" width="33%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="32%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="33%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="33%">
              <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>303
                Lippincott Centre, Marlton, NJ</u></font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="32%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="33%">
              <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>08053</u></font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="33%">
              <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">(Address
                of Principal Executive Offices)</font></div>
            </td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="32%">&#160;</td>
            <td align="left" valign="top" width="1%">&#160;</td>
            <td align="left" valign="top" width="33%">
              <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>

      </table>
    </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"><u>Registrant&#8217;s
      telephone number, including area
      code</u>:&#160;&#160;&#160;&#160;&#160;&#160;&#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="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>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>
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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">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>
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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: Wingdings">&#168;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 36.75pt">&#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>
    <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: 36.75pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
      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: 36.75pt">&#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: 45pt; TEXT-INDENT: -45pt; 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: 36.75pt">&#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><br>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; WIDTH: 100%; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
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      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div><br>
    <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: Times New Roman"><strong>Item
      1.01</strong></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 36.75pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Entry</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>&#160;</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>into
      a Material Definitive Agreement.</strong></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: 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, a wholly-owned subsidiary of Hill
      International, Inc. (the &#8220;Registrant&#8221;) entered into material definitive
      agreements not made in the ordinary course of business with the directors and
      certain affiliates of James R. Knowles (Holdings) PLC (&#8220;Knowles&#8221;) to acquire
      approximately 69.4% of the outstanding shares of Knowles for a price of 33
      pence
      (approximately $0.61) per share in cash. Knowles is a construction and
      engineering industry claims consulting and dispute resolution company with
      36
      offices worldwide, headquartered in Daresbury, United Kingdom. At the same
      time,
      the boards of directors of both the Registrant and Knowles approved the terms
      of
      a cash offer by Hill International SA for all of the issued shares of Knowles
      at
      a price of 33 pence (approximately $0.61) per share. This offer values Knowles
      at approximately $13.0 million.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></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">In
      addition, on July 20, 2006, Hill International SA entered into agreements with
      other shareholders of Knowles to acquire approximately 10.6% of the outstanding
      shares of Knowles for a price of 33 pence (approximately $0.61) per share in
      cash, subject to the contingency that such agreements will cease to be binding
      if those Knowles shareholders receive a competing offer for their Knowles shares
      at a price that is greater than 36.3 pence (approximately $0.67) per share.
      </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></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">The
      agreements are subject to a number of conditions to closing typical for
      agreements of this kind, including, without limitation, that Hill International
      SA receive no less than 80% of the outstanding shares of Knowles, or such lower
      percentage as Hill may determine while the offer is outstanding. </font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></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">Copies
      of
      the agreements between Hill International SA, the Registrant and Knowles are
      attached as exhibits to this Current Report. On July 21, 2006, the Registrant
      issued a press release announcing the cash offer by Hill International, SA
      for
      the shares of Knowles and the&#160;execution of the aforementioned agreements
      between the Registrant, Hill International SA and certain of the shareholders
      of
      Knowles. A copy of the press release is attached hereto as an exhibit.
</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#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
      9.01.</strong></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Financial
      Statements and Exhibits. </strong></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">(d)</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>Exhibits</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>
      <table cellpadding="0" cellspacing="0" width="100%">

          <tr>
            <td align="left" 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="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Exhibit
                No.</u></font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%" 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>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.1</font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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 Active Capital Trust
                PLC.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.2</font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.3</font></div>
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            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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.</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"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.4</font></div>
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            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.5</font></div>
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            <td width="1%">&#160;</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">Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst &amp; Young LLP from White Rose Nominees
                Limited.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.6</font></div>
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            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.7</font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.8</font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">10.9</font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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 Brian Stephen
                Quinn.</font></div>
            </td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">&#160;</td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">&#160;</td>
          </tr>
          <tr>
            <td align="left" valign="top" width="14%">
              <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">99.1</font></div>
            </td>
            <td width="1%">&#160;</td>
            <td align="left" valign="top" width="66%">
              <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">Press
                release of the Registrant dated July 21,
                2006.</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="left">&#160;</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"><strong>SIGNATURES</strong></font></div>
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    <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 width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Dated:
              July 26, 2006</font></td>
            <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: "><strong>HILL
              INTERNATIONAL, INC.</strong></font></td>
          </tr>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">By:&#160;&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
              Irvin E. Richter</font></td>
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            <td align="left">
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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">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
                Officer</font></div>
            </td>
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{"company-data": {"conformed-name": "Hill International, Inc.", "cik": "0001287808", "assigned-sic": "6770", "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": "06981504"}, "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"}}
Unassociated Document
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): July 20, 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
      1.01
Entry
into
      a Material Definitive Agreement.
On
      July
      20, 2006, Hill International SA, a wholly-owned subsidiary of Hill
      International, Inc. (the "Registrant") entered into material definitive
      agreements not made in the ordinary course of business with the directors and
      certain affiliates of James R. Knowles (Holdings) PLC ("Knowles") to acquire
      approximately 69.4% of the outstanding shares of Knowles for a price of 33
      pence
      (approximately $0.61) per share in cash. Knowles is a construction and
      engineering industry claims consulting and dispute resolution company with
      36
      offices worldwide, headquartered in Daresbury, United Kingdom. At the same
      time,
      the boards of directors of both the Registrant and Knowles approved the terms
      of
      a cash offer by Hill International SA for all of the issued shares of Knowles
      at
      a price of 33 pence (approximately $0.61) per share. This offer values Knowles
      at approximately $13.0 million.
In
      addition, on July 20, 2006, Hill International SA entered into agreements with
      other shareholders of Knowles to acquire approximately 10.6% of the outstanding
      shares of Knowles for a price of 33 pence (approximately $0.61) per share in
      cash, subject to the contingency that such agreements will cease to be binding
      if those Knowles shareholders receive a competing offer for their Knowles shares
      at a price that is greater than 36.3 pence (approximately $0.67) per share.
The
      agreements are subject to a number of conditions to closing typical for
      agreements of this kind, including, without limitation, that Hill International
      SA receive no less than 80% of the outstanding shares of Knowles, or such lower
      percentage as Hill may determine while the offer is outstanding.
Copies
      of
      the agreements between Hill International SA, the Registrant and Knowles are
      attached as exhibits to this Current Report. On July 21, 2006, the Registrant
      issued a press release announcing the cash offer by Hill International, SA
      for
      the shares of Knowles and the execution of the aforementioned agreements
      between the Registrant, Hill International SA and certain of the shareholders
      of
      Knowles. A copy of the press release is attached hereto as an exhibit.
Item
      9.01.
Financial
      Statements and Exhibits.
(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.
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.
10.3
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from Michael Conrad
                Charlton.
10.4
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Peter
                Bates.
10.5
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from White Rose Nominees
                Limited.
10.6
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Roger
                Knowles.
10.7
Director's
                Irrevocable Undertaking, dated July 20, 2006, to Hill International
                SA,
                Hill International, Inc. and Ernst & Young LLP from Wendy
                Knowles.
10.8
Irrevocable
                Undertaking, dated July 20, 2006, to Hill International SA, Hill
                International, Inc. and Ernst & Young LLP from Wynton Services
                Limited.
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.
99.1
Press
                release of the Registrant dated July 21,
                2006.
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:
              July 26, 2006
HILL
              INTERNATIONAL, INC.
By:
/s/
              Irvin E. Richter
Name:
                Irvin E. Richter
Title:
                Chairman and Chief Executive
                Officer