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A systematic investigation of the functions of a real or planned system. [ ISO/IEC 2382-1 ]
Functional Analysis [ ISO/IEC/IEEE 24765 ]: Examination of a defined function to identify all the sub-functions necessary to accomplish that function, to identify functional relationships and interfaces (internal and external) and capture these in a functional architecture, to flow down upper-level performance requirements and to assign these requirements to lower-level sub-functions.