Chapter 9 discussed fundamental characteristics of acceptance sampling plans for attributes. In particular two of the characteristics were related to protection, namely the OC and AOQ curves, while the other two were related to cost, that is, the ASN and ATI curves. Calculations of these various curves for single and double sampling plans were discussed and illustrated. In Section 9.11 there was presented a method for finding a plan matching two points on the OC curve, a table being given for I the case when p95 and p10 are both specified.