Search

Under sequential screening, a production lot is inspected item-by-item; the decision is made after inspecting each item whether to inspect another item or to reject the remainder of the lot; and thus uninspected items are never accepted. This screening process is a special case of the sequential sampling considered in Wortham and Wilson (1971). The process is formulated as an optimal stopping problem using a Bayesian approach. Based on an analysis of the structural properties of the optimal policy, a backward-recursive optimal algorithm, which is more efficient than the existing algorithm for optimal sequential sampling, is developed.

In the February, 1982 issue of Interfaces, Schick and Kunnecke infer that academic grades and quality of institution are poor indicators of employment retention. Although the analysis is qualified by “limitations and reflections,” the general hypothesis is that these characteristics may not be indicators of employee retention, that is, graduates of prestigious institutions with high grades can be expected to change jobs early in their careers. We believe that the authors have not appropriately tested this hypothesis, and it is our contention that there is at least a possibility for an alternative interpretation of the data.

Erratum To “Economic Design of np Charts for Processes Subject to a Multiplicity of Assignable Causes” By Wing-Kin Chiu, Management Sci. 23 (4, December) (1976).

Erratum To “Economic Design of Fraction Defective Control Charts” By Montgomery, Heikes and Mance, Management Sci. 21 (11, July) (1975).