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Requirements Engineering Fundamentals by Chris Rupp, Klaus Pohl

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Requirements Modeling in the Functional Perspective

The functional perspective of requirements deals with the transformation of input data received from the environment into output data released into the environment of the system. There are a number of different model-based approaches that can be used to model the functional perspective of requirements. The majority of these techniques is based on the structured system analysis approaches of the 1970s and 1980s, such as the structured analysis [DeMarco 1978, Weinberg 1978] or the essential system analysis [McMenamin and Palmer 1988.].

Data Flow Diagrams

At the center of attention of modeling requirements from a functional perspective are diagrams that model the functionality of the respective system ...

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