simulation system for modeling air traffic situations is described. Real- or fast-time control of many aircraft over easily defined routes is provided. Simulated aircraft can be vectored manually or instructed to follow routes predefined by the experimenter. Special language forms have been developed for describing both the geographical and procedural aspects of these routes. The program runs in a PDP-10 timeshared computer and capitalizes on some of the standard system features. The influence of the interactive computer environment on the program's development and operation is discussed.
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