Structured analysis and design technique

"SADT" redirects here. For another use, see Self accelerating decomposition temperature.

Structured analysis and design technique (SADT) is a systems engineering and software engineering methodology for describing systems as a hierarchy of functions. SADT is a structured analysis modelling language, which uses two types of diagrams: activity models and data models. It was developed in the late 1960s by Douglas T. Ross, and was formalized and published as IDEF0 in 1981.

It is often contrasted with Object-oriented analysis and design.

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