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Strategies for Real-Time System Specification by Imtiaz A. Pirbhai, Derek J. Hatley

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Chapter 5. The Control Model

We are now ready to address the control structure of the requirements model—the control flow diagrams and control specifications illustrated in Figure 3.1, and repeated here in Figure 5.1 for convenience. CFDs and CSPECs are closely associated with each other and with the data structure. Overall, the purpose of the control structure is to determine what the process structure must do under any given external or internal conditions or operating modes.

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Figure 5.1. The control structure (highlighted).

Within the process structure, such decisions are restricted to the lowest level—the decision construct inside the PSPECs. ...

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