Chapter 3. Overview

Our strategy is to establish what the desired end product is, before describing how to produce it. Consequently, in Part II, we describe in detail the completed requirements model, as it would be received by the user, and in Part III, we describe how to construct the model. The principal tools of the requirements model are flow diagrams: graphical models of signal flows and processes acting on those flows. Flow diagrams consist of data flow diagrams and control flow diagrams. The former are essentially the same as the DFDs of DeMarco [4]; the latter are similar to DFDs but with some important and unique differences.

The other components of the requirements model are process specifications and the requirements dictionary (which ...

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