ABSTRACT
This chapter is concerned with control charts for attribute or countable data involving "defects". The term defect covers a wide range of possible severity. On the one hand it may be merely a flaw or a detectable deviation from some minimum or maximum limiting value, or on the other, a fault sufficiently severe to cause an untimely product failure. The chapter provides a discussion on product quality rating method and presents the basic formulas for control charts for attributes.
