2.2. Framework for quality improvement
The framework in Fig. 3 is proposed for the inspection of finished products and investigation of the source of defects.
Minimum or zero defects per produced unit is a function of minimum effect from manufacturing system variables.
MinXR ¼ f ðVar1; Var2; Var3; . . . ; VarnÞ,
where R ¼ defects per piece and Var1; . . . ; Varn ¼ process variables affecting product quality.