Kemp and Kemp have proposed a scheme of inspection for two types (A and B) of non-conformity. There is serial inspection for type A, continuing until a sequence of k successive A’s is observed. These k items are discarded, and all previous items (since the last inspection for A) are subject to a Dorfman group-screening inspection procedure for B. The paper develops formulae for the properties of this scheme, when inspection (for both A and B) may not be perfect, allowing for both false negatives and false positives. Some numerical values given by the formulae are presented, with a view to assessing the robustness of Kemp and Kemp’s scheme.
