The previous chapter dealt with a machining problem that created significant assembly and downtime problems when nonconformances spiked to an unacceptable level. The amount of rejected product that was being generated threatened the production schedule of an engine assembly line. Only through a thorough analysis of the machining differences was the cause recognized for correction. These differences were caused by a lack of machine process targeting in an initial machining operation and the lack of recognition of the potential for the ensuing problem.