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Keith M. Andress, coauthor of "Evidence Accumulation and Flow of Control in a Hierarchical Spatial Reasoning System, " is a research associate in the Robot Vision Lab at Purdue University His research interests are in formalisms for accumulation of evidence, expert systems, and computer vision. Steven J. Frank, author of "What AI Practitioners Should Know about the Law. Part Two" is an attorney practicing with Nutter, McClennen & Fish, One International Place, Boston, Massachusetts 02210-2699. Martin Herman, coauthor of "A Framework for Representing and Reasoning about Three-Dimensional Objects for Vision" is group leader of the Sensory Intelligence Group in the Robot Systems Division at the National Bureau of Standards, Gaithersburg, MD 20899. His research interests are robotics, robot vision, image understanding, world modeling, real-time planning, autonomous vehicles, and remotely operated vehicles Avinash C. Kak, coauthor of "Evidence Accumulation and Flow of Control in a Hierarchical Spatial Reasoning System, " is a professor of electrical engineering at Purdue University.