4. Finding the system's negation
The negation of this system characterizes its internal constraints so as not to damage the external environment (ME).
In this section, draw on the user's expression of need, then on your expertise in your field.
Often subtle functions are expressed in this analysis. Don't overlook them, as they can make all the difference to your competitors' products.
Don't forget that you can use this information to build your sales pitch, but also that everything you say needs to be demonstrated, checked and measured.
Example 1: the system studied is an armoured door
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Finding the system's negation
Characterize functions
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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