Evaluating the impact of operating conditions on the performance of appointment scheduling rules in service systems

Article Abstract:

A study was conducted to analyze the influence of operating conditions on the efficiency appointment scheduling rules in service systems. The environmental factors considered in the study were the coefficient of variation of service times and the number clients per service session. The possibility of minimizing costs and enhancing service quality were also analyzed. Results indicated that the selection and use of an appointment scheduling rule was situation-specific.

Management Dynamics NEC, Service Industries, Management, Scheduling (Management), Services industry, Management techniques

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Optimal ordering policies with two suppliers when lead times and demands are all stochastic

Article Abstract:

A study is conducted to evaluate the development of procedures for determining optimal order policy. The study considers total order quantity, reorder point and proportion of split between two suppliers as inherent parts of such order policy and focuses on the optimization goal of reducing holding and order costs. Results show that procedures may be developed for managing any stochastic process involving lead times and demands.

Inventory control, Stochastic processes, Lead time

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A proposal on improved procedures for estimating task-time distributions in PERT

Article Abstract:

A two-step procedure for improving the Program Evaluation and Review Technique's estimation formula for computing the stochastic time duration of a task is introduced. The approach consists of a seven-point fractile-estimation and the derivation of a beta and a Ramberg-Schmeiser distribution function to minimize the mean square deviation between the distributed function and the estimated fractiles.

Network analysis (Planning), Project management, Program Evaluation and Review Technique

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