A design unit is a self-contained collection of processes, data stores and data flows that share similar design attributes. It serves as a subset of the total system whose inputs, outputs, files and databases, and programs can be designed, constructed, and unit tested as a single subsystem.

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A design unit is indeed a self-contained subset of a system that includes processes, data stores, and data flows, allowing it to be designed, constructed, and tested independently as a single subsystem.

A Design Unit Is a Self-Contained Collection of Processes, Data