Conditional Zero Acceptance Number (COZAN) Plan

Abstract

A new plan is proposed for small‐sample situations using which a one‐third reduction in sample size can be achieved compared to the sample size of an equivalent zero acceptance number single sampling plan. This plan utilises the results of three successive samples for taking decision on acceptance of the lot under consideration. The plan is also robust to lot‐to‐lot quality trends.

A lots-dependent variables sampling plan considering supplier’s process loss and buyer’s stipulated specifications requirement

“…However, their disadvantages are twofold. First, single sampling can impose a psychological disadvantage on the supplier, since no further reference or second chance is given for rejected lots (Govindaraju 1990;. Second, in advanced manufacturing processes, supplier production is frequently continuous, so the quality of preceding and/or successive lots is expected to be homogeneous and dependent (Kuraimani and Govindaraju 1992).…”