5. How do you check that you've found all the functions?
The group's job is to list all the ideas without judging them. The aim is to find all the service functions without forgetting any, to distinguish the main functions, the constraint functions, and then the corresponding technical functions.
In this quest, don't reject any suggestion; it will become null and void in the next stage of characterization and prioritization if the :
is badly formulated (the vocabulary is wrong);
is not to be taken into account (is not a need expressed by the user);
is included in another function (a detail of a more global function) ;
is not in the life cycle phase under study (maintain in state is not a function of the "use" life cycle phase).
Here are...
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How do you check that you've found all the functions?
Mandatory function search methods
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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