SADT (Structured Analysis and Design Technique) is a Software Engineering technique for describing systems as a hierarchy of functions
Techniques
SADT uses two types of diagrams: activity models and data models. It uses arrows to build this diagrams.
The Semantics of Arrows
For activities: Inputs are data that are consumed by the activity. Outputs are produced by the activity. Controls influence the execution of an activity but are not consumed.
For data: Inputs are activities that produce the data. Outputs consume the data. Controls influence the internal state of the data.
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