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This is a summary of the Workshop on Planning that was sponsored by the Defense Advanced Research Project Agency and held in Santa Cruz, California, on October 21-23, 1987. The purpose of this workshop was to identify and explore new directions for research in planning. For the purposes of this article, a planner is a program that controls one or more devices capable of carrying out actions in the real world in order to achieve some definite purpose. A strategic planner is capable of anticihe workshop was organized into five sessions. Each session was intended to examine some aspect of planning research or point directions toward future work.