A discussion of two types of computer graphics displays used to analyze data following simulations done in the GPSS language. The results showed that the hybrid display showing changes over time (and utilizing a Gantt chart) was superior to the display sequentially presenting individual states of a system. Additional general conclusions are that (1) an analyst almost never views simulation data the right way on the first try; (2) computer graphics helps an analyst identify relationships obscured by summary statistics; and (3) computer graphics displays should be tested for usefulness by the people for whom they are designed.
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