Across the life cycle of delivering a product to market, engineers face many obstacles. They often find themselves spending a lot of time reworking or repairing parts that fail inspection but may fit and function properly when assembled; or, they might pass inspection but do not fit with other parts and assemblies. Engineers also find themselves disagreeing with vendors concerning whether parts are made dimensionally correct or not, based on different understandings about design intent in regards to form, fit, and function.