3. Find the system reaction
The notion of reaction draws on the principles of physics. An action leads to a reaction (the principle of air escaping from a balloon and propelling it across the room).
Your study of the system or product consists, in this stage, of highlighting the reaction of each of the actions you have identified and the reaction of the system or product with the elements of the external environment (EME).
More specifically, the system's reaction characterizes its ability to defend itself against external aggression and against itself.
By studying the elements of the external environment (EME), you find all the system's defense reactions. Express them in simplified form, in a table, distinguishing between a service function (SF) and a technical function (TF).
You bring out the notions :
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Find the system reaction
Finding the system's negation
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...
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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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