What is the unit of measure used by the IFPUG Functional Size Measurement Method
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Feature pointa
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External reference files
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Function points
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Internal Interface files
The IFPUG (International Function Point Users Group) Functional Size Measurement Method uses function points as the unit of measure. Function points quantify software functionality based on user requirements, independent of technology, making it useful for project estimation and productivity measurement.
The IFPUG (International Function Point Users Group) Functional Size Measurement Method uses Function Points as its unit of measure — a technology-independent metric derived from counting external inputs, outputs, inquiries, and internal/external logical files, each weighted by complexity. 'Feature points' is a related but distinct (and misspelled here) variant used for measuring algorithmically complex software, not the IFPUG standard unit. 'External reference files' and 'Internal Interface files' are components counted within the method, not the unit of measure itself.