FUN (FUNction point measurement) is a system for the automated measurement of the Function Point software metric from specifications expressed in the form of an Entity Relationship (ER) diagram and a Data Flow Diagram (DFD). FUN has been implemented in Prolog.

FUN was developed with two aims:

• To show how IFPUG informal counting rules can be translated into rigorous unambiguos rules expressing properties of the ER-DFD.

• To demonstrate that the translation allows an easy automation of the counting process.

The following paper provides a description of the main ideas behind the system:

• E. Lamma, P. Mello, F. Riguzzi. A system for measuring function points from an ER-DFD specification. The Computer Journal, 47(3), May 2004.

Obtaining FUN:

FUN is copyrighted by Evelina Lamma, Paola Mello and Fabrizio Riguzzi and is available under The Artistic License 2.0 by the Perl Foundation:

• Windows executable

• SWI Prolog sources

• The input file for the application Human Resources described in IFPUG Case Study 2

• Other examples

• An extensive case study: specifications and FUN input file.

• A package (authored by Dario Dioli) containing two applications:
  • EasyERDFD: an application for graphically drawing ER-DFD diagrams and saving them in the dot format
  • GraphFun: an application for converting ER-DFD diagrams from the dot format to the inpuf format of FUN and viceversa.

If you find it useful please send impressions of use (including comments on its accuray) to Fabrizio Riguzzi.