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Analytical techniques applied throughout the development cycle can contribute significantly to the development of a successful ~ computer system. In this paper, we have tried to illustrate the value of doing the appropriate level of performance evaluation at each stage of a development cycle. The particular types of techniques used depend on the level of complexity and performance considerations associated with a particular project. A simple pencil and paper approach with observations of program execution may suffice for a small project. On a large system development project where the performancoef more complex computers and other resources are critical, more extensive techniques are usually required. Here it may be necessary to judge the adequacy of system design, details of software design, and computer configurations in the expected total system environment. The analyst, using the techniques of digital simulation models and computer system monitors, can take this perspective. This was the course followed in the development of the Skylab Terminal System described in this paper.
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