This research was carried out while F. Glover and E.A. Silver were visiting the Swiss Federal Institute of Technology in Lausanne during the summer term 1990. The support of this institution is gratefully acknowledged. This work was also partly supported by the AFOSRj ONR Research Contract F49620-90-C-0033 and by the Natural Sciences and Engineering Research Council of Canada under Grant No. A 1485.Professor Glover is the recipient of numerous awards and honorary fellowships;
including those from the American Association for the Advancement of Science;
the NATO Division of Scientific Affairs;
the Institute of Management Science;
the Operation Research Society;
the Decision Science Institute;
the U.S. Defense Communications Agency;
the Energy Research Institute;
the American Assembly of Collegiate Schools of Business;
Alpha Iota Delta;
and the Miller Institute for Basic Research in Science. He serves on the advisory boards of several organizations and is co-founder of Optimization Technologies;
Inc;
Analysis and Research and Computation;
and the nonprofit research organization Decision Analysis and Research Institute;