SysTech Software Solutions, P.O. Box 413, Annandale, VA;Knowledge Systems Group Basser, University of Sydney, N.S.W. 2006, AUSTRALIA;Bell Canada, Quality Engineering and Research, 2265 Roland Therrien Blvd., Longueuil, QC J4N 1C5, CANADA;High Performance Software, Inc., PO BOX 292466 Dayton, OH;Systems Research Center, Department of Computer Science, Virginia Polytechnic Institute & State University, Blacksburg, VA;Systems Research Center, Department of Computer Science, Virginia Polytechnic Institute & State University, Blacksburg, VA;Mesquite Software, Inc., 8920 Business Park Drive, Austin, TX