You are creating a model that shows how data moves through a system. Each function that modifies the data in any manner is identified, decomposed to smaller levels, and the system is completely descri

Functional decomposition breaks complex functions into smaller sub-functions for clarity but does not specifically model the movement or transformation of data through a system.

Data flow diagramming (DFD) is specifically designed to illustrate how data moves through a system, identifying every process or function that transforms the data along the way. DFDs can be decomposed into multiple levels of detail, from a high-level context diagram down to granular sub-processes. This technique describes the complete lifecycle of data from its origin through every transformation to its final storage destination.

Organization modeling represents the structure, roles, and relationships within an organization and has no focus on how data flows or is transformed.

Work decomposition (such as a WBS) breaks project work into manageable tasks but does not describe data movement or transformation within a system.