Glossary Term: Form, Fit and Function (FFF)

The Form, Fit and Function is a framework description of an item’s identifying characteristics. Each of the aspects helps engineers match parts to the needs of the products. Using this framework allows for flexibility in change by allowing changes to be made without documentation so long as the changes align with the form, fit and function of the product.

Form refers to physical characteristics including shape, size, dimensions, weight and other uniquely distinguishable characteristics.

Fit is the ability of a product or subassembly to connect or become an essential part of another product. The fit allows parts to meet engineering tolerances that allow the product to be useful.

The function is the effective and reliable action a product or subassembly is designed to perform.

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