Structured Analysis and Design Technique
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- For the chemical reaction SADT, see Self Accelerating Decomposition Temperature
Structured Analysis and Design Technique — SADT is a Software Engineering technique for describing systems as a hierarchy of functions.
[edit] Techniques
SADT uses two types of diagrams: activity models and data models. It uses arrows to build these diagrams.
[edit] The Semantics of Arrows
For activities:
- Inputs enter from the left and represent data or consumables that are needed by the activity.
- Outputs exit from the right and represent data or products that are produced by the activity.
- Controls enter from the top and represent commands which influence the execution of an activity but are not consumed.
- Mechanisms identify the means, components or tools used to accomplish the activity. Represents allocation of activities.
For data:
- Inputs are activities that produce the data.
- Outputs consume the data.
- Controls influence the internal state of the data.
SADT is a method based in systems theory. Also see IDEF0.
SADT is available as a commercial CASE tool under the name IDEF0.
