Form, Fit, Function, and Interface (F3I) (glossary)
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A concept used for the update or upgrade of a system whereby a only a portion or subsystem of the entire system is replaced. The updated item is said to be Form/Fit/Function and interface compatible when it can be inserted into the existing system without impacting system operation.
Source
None cited.
Discussion
Discussion as to why this is the "consensus" definition for the SEBoK.