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

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Chapter 13. Preparing Process Specifications

13.1 The Role of Process Specifications

Ultimately, it is the PSPECs and their interconnections that define the processing requirements. All the data flow diagrams could, in principle, be thrown away and no information would be lost. Removing the DFDs would take Figure 4.11 one further decomposition step, and would replace all the primitive bubbles with their PSPECs, which is not a very useful representation but which would provide all the information you could possibly need.

It is at the PSPEC level that we finally remove the last trace of abstraction, and get completely specific. The reader of the PSPEC can see precisely what the transform from input to output is to be. The primary role of the ...

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