A description of the use of interactive computer-graphic analysis in simulating, and then designing and developing, RAND's Video Graphic System, which will provide low-cost, high-capability, responsive, graphic computer access to many users simultaneously. Simulation began before the system was fully defined, as an aid to design. The graphic displays were presented on an IBM 360/40; the user entered data via the RAND Tablet. Of the three types of display--Statistics, Variable Graph, and Gantt Chart--the latter was used most. Graphic analysis cut total modeling time approximately in half. Since much hard copy was pasted into strip charts, these should be produced automatically. Graphics capabilities facilitated analysis of a large volume of simulation output to examine the model in detail and to discover anomalous behavior; ongoing simulation proved a valuable aid to design. 28 pp. Bibliog
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