Two-stage replacement strategies and their application to manpower planning

Two-stage replacement strategies are described and related to manpower systems. This consists of setting up a training grade to supplement an organization of fixed size. Results are obtained to show what size the training grade should be in order that, on average, people spend some predetermined length of time in the training grade before promotion. Two promotion rules are used, viz. promotion by seniority and promotion at random. Numerical results are given for particular completed length of service distributions.