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Description of simulating PHYSBE (Physiological Simulation Benchmark Experiment) with BIOMOD, an interactive computer graphics system specifically designed for unsophisticated computer users. Programming was simple because PHYSBE's original description is mostly in terms of a block diagram and integral equations, which BIOMOD provides for, and because BIOMOD's diagnostic messages and quick response aid in discovering and correcting errors. Elapsed programming time was five hours, including studying the definition of PHYSBE and debugging. BIOMOD made exploring PHYSBE's behavior easy by providing complete control of both simulation and display of output curves. The CSMP/360 program that BIOMOD produced for PHYSBE was run in batch-mode to determine the cost of BIOMOD's facilities. BIOMOD required twice as much storage as the batch-mode program, but only about 10 percent more CPU utilization when running and simulating and formating the results. BIOMOD's provisions for easy programming and model exploration justify this cost. (See also R-617, R-746, R-747.)

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