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Knowledge-Based Backtracking," is a principal researcher for the Advanced Technology Center, Boeing Computer Services, P.O. Preston A. Cox, coauthor of "Real-Time Knowledge-Based Systems," is a scientific programmer specialist for Lockheed's Space System Division in Sunnyvale, California. Rebecca Gomez is a graduate research assistant at the Computing Research Laboratory, New Mexico State University, Las Cruces, New Mexi-0.88003. Kentieth M. Kahn, author of the workshop report "Concurrent Logic Programming, Metaprogramming, and Open Systems, " is a member of the research staff at Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, California 94304. His interests include computer language design, distributed computing, logic programming, parallel computations, and object-oriented programming.