Abstract
This chapter discusses computer systems, models, and simulations in the application of variety of planning techniques. Many systems under study today are large to such an extent and have so many components that their behavior cannot be calculated directly from physical or statistical principles. If improvements are proposed in a system that is difficult or highly undesirable to experiment with, to evaluate the proposals, a computer model may be constructed and simulations can be carried out on it. Different kinds of models can be used to aid in systems analysis and design. In systems analysis, Churchman (1968) has described five basic aspects of a system, namely, the total system objectives, the environment, the components, the resources, and the management. However, there will be external variables and parameters that describe the environment and internal parameters that are associated with the components.
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