Chapter 15. Function Point Sizing

Function points measure the size of what the software does, rather than how it is developed and implemented.1

1. Dekkers, C.A., “Managing (the Size of) Your Projects,” CrossTalk (Hill AFB, UT: Software Technology Support Center, February 1999), p. 23.


Function point (FP) analysis2 is a method for predicting the total size of a software system. FPs measure software size by quantifying the system functionality provided to the estimator based primarily on the system’s logical design.

2. International Function Point Users Guide, Function Point Counting Practices Manual: Release 4.2 (Westerville, OH: IFPUG, 2004). Release 4.2 makes it possible to correctly separate size and effort in an estimate. ...

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