rima

Defective is binary. Yes or No hence it follow Binomial Distribution. Defect can be more in count or equal to defective count depend on the operation definition, Defect follows Poisson Distribution. For example if i do a project on reducing number of defective invoice , then one parameter like wrong currency is enough to reject the invoice. However if i define invoice number, invoice amount, invoice currency , invoice approver, po number these 5 as criteria of defect count any one parameter go wrong then my invoice stands defective. Based on this we use DPMO for defect and Defective yield concept.