4. Distinguish the type of function
With a little common sense, you've found the service functions and the technical functions.
But you want to find all the functions without forgetting any, and use standardization.
You'll need to classify and order the functions, then characterize them, and finally prioritize them. But there are two types of service function (SF). You need to distinguish between them, and use standardization to express them.
If you're using commercially-available software, you'll need to follow certain rules, starting with function research and studying the relationships between the product or system and its environment.
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Distinguish the type of function
How do you check that you've found all the functions?
Bibliography
Also in our database
Regulations
AFNOR NF X 50-100 November 2011: Value Management – Functional analysis, fundamental characteristics – Functional analysis: functional analysis of the need (or external) and technical/product functional analysis (or internal) – Requirements for deliverables and implementation procedures
AFNOR NF X 50-151 September 2007: Value Management – Functional expression of need...
Websites
The " Sciences de l’Ingénieur " website provides comprehensive examples of functional analysis. This link will take you directly to the list of available examples. In the "Resources" tab, type in the keyword "Functional analysis".
INPI (the Soleau envelope in practice) is available...
Acronyms and abbreviations
AF: functional analysis
AFE: external functional analysis
AFI: internal functional analysis
FAST: Function Analysis System Technic
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