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#REDIRECT> [[Engineering design process]]
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The term "'''form, fit and function'''", sometimes called F3 or FFF, in the [[manufacturing]] and [[technology]] industries is a description of an item's identifying characteristics. If the specifications, or [[:wikt:criteria|criteria]], for form, fit and function of a particular item are met, then the item may generally be considered interchangeable with other items with the same requirements.
The assessment of impact on form, fit, and function is commonly used to determine if a proposed change to a part will be "minor", that is, it has no impact on the form, fit, and function, or "major", that is, it does impact the form, fit, function. The F3 rule is at the basis of enterprise material management systems, ERP, Product Data Management (PDM) or Product Lifecycle Management (PLM) systems.
==Definition==
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