Queuing theory has been applied to a variety of business situations related to customer involvement. The firm provides service facility and tries to keep the costs and time minimum to infuse goodwill among customers. This necessitates the study of service facility to obtain the number of customers and their waiting time. Control chart technique may be applied to analyze the services and the effective performance of concerns. Control chart constructed for the time spent in the system provides

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... prior idea about expected waiting time, maximum waiting time and minimum waiting time which guarantees customer's satisfaction. Keeping this in view, the construction of control chart for M /M /s queuing model with infinite capacity is proposed in this paper.