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An overview of BIOMOD, an operational system designed to enable unsophisticated computer users to study models of dynamic systems, this report presents a scenario describing the construction and simulation of a drug effect model, briefly describes the system implementation, and discusses experience with users. BIOMOD employs a graphics console comprising a television screen, a data tablet, and a keyboard. A user constructs a model by drawing block diagrams and handprinting or typing text while receiving immediate feedback about the interpretation of his actions. Each component of a model block diagram may be defined either by another block diagram, or by one of the other user-oriented languages: analog-computer-like elements; algebraic, differential, or chemical equations; or FORTRAN statements. During model simulation, displayed curves are continually and automatically updated; the user may stop the simulation and plot different variables, change scales and/or parameter values, and then continue the simulation. (See also R-746, R-747.)

This report is part of the RAND Corporation Report series. The report was a product of the RAND Corporation from 1948 to 1993 that represented the principal publication documenting and transmitting RAND's major research findings and final research.

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