2. Organizing functions
It is important that the functions and constraints selected for the solution studied :
are independent and non-redundant: study any goal/medium relationships between the various functions expressed, asking the "Why?" and "How?" questions for each one;
are those of the solution under study and not of a larger whole or a component: use in the expression only elements directly related to the solution;
are linked to their specific context: separate functions for different contexts: life-cycle stages, use situations, user categories...
A final inventory containing more than a dozen functions for a product will often be the sign of an incomplete organization: some expressed functions may be criteria of other functions (group them together), or...
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Organizing functions
Characterize functions
Bibliography
Expressing needs (applications of the functional approach) , AFAV, Édition AFNOR Gestion, 1989/1998
Desmesnards P. H., Réussir l'analyse des besoins , Eyrolles – Éditions d'Organisation, 2007
ToolWebsite
www.afav.eu AFAV association website – Value and management, for the development of Value methods
AFNOR standards
NF EN 1325: value analysis vocabulary
NF X50-100: functional analysis – fundamental characteristics
FD X50-101: general tools
NF X50-151: functional expression of need and CDCF
Acronym
CDCF: functional specifications
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