Editing Functional decomposition (section)

{{Short description|Expression of a function as the composition of two functions}}
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In [[engineering]], '''functional decomposition''' is the process of resolving a [[Function (mathematics)|functional]] relationship into its constituent parts in such a way that the original function can be reconstructed (i.e., recomposed) from those parts.

This process of decomposition may be undertaken to gain insight into the identity of the constituent components, which may reflect individual physical processes of interest. Also, functional decomposition may result in a compressed representation of the global function, a task which is feasible only when the constituent processes possess a certain level of ''modularity'' (i.e., independence or non-interaction).

[[Interaction (statistics)]]{{clarify span|(a situation in which one causal variable depends on the state of a second causal variable)|reason=The notion of 'interaction' of mathematical functions is undefined, likewise for 'observable', 'perception' etc. I guess this paragraph confuses mathematical notions (like 'function') with physical intuitions (like 'process'); this should be fixed.|date=September 2020}} between the components are critical to the function of the collection. All interactions may not be {{clarify span|[[Observability|observable]], or measured|date=September 2020}}, but possibly deduced through repetitive {{clarify span|[[perception]]|date=September 2020}}, synthesis, validation and verification of composite behavior.