This article attempts to give the analyst some guidelines for making the choice between GERTS (Graphical Evaluation and Review Technique Simula tion program) and general-purpose simulation tech niques. GERTS allows the analyst to simulate without performing any programming. GERTS also represents a system in a network model which aids communications with nonsimulators. Examples are given of the types of problems in which GERTS is preferred to general- purpose simulation techniques. The approximation of complicated systems using GERTS is also considered.
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