2. Find the system action
The action of the system under study characterizes its essential raison d'être .
You've already listed all the actions the system needs to perform, starting from the user's needs; do it again with a fresh, candid eye. Instead of starting with the user's needs, start with the product.
You need to find all the system's service functions (SFs). If you find more than one, it's because you've forgotten a function or you've formulated the functions incorrectly (used the wrong verb or complement).
Example 1: the system studied is an armoured door
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Find the system action
Find the system reaction
Bibliography
Also in our database
Regulatory references
AFNOR NF X 50-100 November 2011: Value Management – Functional analysis, fundamental characteristics – Functional analysis: functional analysis of needs (external) and technical/product functional analysis (internal) – Requirements for deliverables and implementation procedures
AFNOR NF X 50-151 September 2007: Value Management – Functional expression of need...
Website
The " Sciences de l’Ingénieur " website provides comprehensive examples of functional analysis. In the "Resources" tab, type in the keyword "functional analysis".
Acronyms and abbreviations
CdCF: functional specifications
AF: functional analysis
AV: value analysis
FAST: Function Analysis System Technic
SADT: Structured Analysis and Design Technic
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