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Function/Process Hierarchy Objects

Each model has one root function. The root function decomposes into activity definitions: function definitions (FUNCTION_DEF) and process definitions (PROCESS_DEF). The root can decompose into either many functions or many processes. Each function definition can decompose into either functions or processes. Each process definition can decompose into other processes.

For each parent activity (function or process) and child activity combination, there is an activity usage (ACTIV_USAGE) that relates them. If a child is reused somewhere else, another usage is created, but only the one definition exists.

The Activity Hierarchy Diagram (AHD) adds function definitions, process definitions, and activity usages.