Functional size measurement

Functional Size Measurement , or FSM for short, is a term from software development and describes the quantitative evaluation of the functional scope of IT systems . The best known procedure for this is the function point analysis .

FSM processes are used in software development and a. to estimate the effort and duration of projects, to evaluate the productivity of the software development process and the business evaluation of IT systems.

The ISO has defined the requirements for an FSM procedure in its standard ISO / IEC 14143. There are currently five different processes that meet the requirements of this standard and are recognized by ISO for this:

• IFPUG Functional size measurement method - ISO / IEC 20926: 2009
• COSMIC Functional size measurement method - ISO / IEC 19761: 2003
• MK II Function Point Analysis - ISO / IEC 20968: 2002
• NESMA Function Points - ISO / IEC 24570: 2005
• FISMA Function Points - ISO / IEC 29881: 2010

The best known and most widespread expression is the IFPUG standard, which is also known under the term function point analysis . Of the project data in the benchmark database of the International Software Benchmarking Standards Group ISBSG (as of 2008), around 80% relate to the evaluation according to IFPUG, almost 9% to FISMA, 4% to the evaluation according to NESMA, 3% to COSMIC and 1% on MK II. IFPUG and COSMIC are the only two methods of international importance.

Web links

• German-speaking user group for software metrics and effort estimation eV (DASMA)
• German-speaking Function Point User Group (defpag.org) eV
• International Function Point Users Group (IFPUG)
• Common Software Measurement International Consortium (COSMIC)
• Nederlandse Software Metrieken Associatie (NESMA)
• Finnish Software Measurement Association (FiSMA)
• United Kingdom Software Metrics Association (UKSMA)

Individual evidence

1. ↑ ISO / IEC 14143-1: 2007: Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts, International Organization for Standardization, Geneva, Switzerland.
2. ↑ ISO / IEC 20926: 2009: Software and systems engineering - Software measurement - IFPUG functional size measurement method 2009, International Organization for Standardization, Geneva, Switzerland.
3. ↑ ISO / IEC 19761: 2003: COSMIC FFP, International Organization for Standardization, Geneva, Switzerland.
4. ↑ ISO / IEC 20968: 2002: Mk II Function Point Analysis, International Organization for Standardization, Geneva, Switzerland.
5. ↑ ISO / IEC-24570: 2005 NESMA Functional Size Measurement Method Version 2.1, International Organization for Standardization, Geneva, Switzerland.
6. ↑ ISO / IEC 29881: 2010 FiSMA 1.1 functional size measurement method, International Organization for Standardization, Geneva, Switzerland.
7. ↑ Manfred Bundschuh, Carol Dekkers: The IT Measurement Compendium, Berlin, 2008, p. 393.