Form, Fit and Function rules specify how much new revisions of a part can deviate from the original before new part numbers are created. This is key in ensuring components can be substituted without issue.
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Form, Fit, and Function (FFF) Definition
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Blog: Rolling Revisions Up the BOM Tree 101
Form-Fit-Function (FFF) Definition and Rules
Evaluating the Change: Form, Fit and Function (FFF)
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