Modified Tightened Three Level Continuous Sampling Plan

In this paper, a modification is proposed to the tightened three level continuous sampling plan. The tightened three level plan is one of the three tightened multi-level continuous sampling plans of Derman et. al. (Annals of Mathematical Statistics 28: 395-404, 1957) with three sampling levels and is designated as MLP – T – 3. Using a Markov chain model, expressions for the performance measures of the modified MLP – T – 3 plan are derived. The modified MLP – T – 3 plan is shown to be identical to the MLP – T – 3 plan and CSP – T plan, where CSP – T plan is a special case of MLP – T – 3 plan. Tables are also presented for the selection of a modified MLP – T – 3 plan when the AQL or LQL and AOQL are specified.