Abstract
Dr D. Y. Barrer and Mr. Kenneth W. Webb have called to my attention a fault in my Letter to the Editor, “A New Measure of Effectiveness for Queuing Problems,” Opns. Res. 8 278–280 (March–April 1960) and have presented constructive criticism regarding the matter. Briefly, the fault resides in the fact that equations (8) and (9) do not recognize the effect of the servers upon the impatience of the customers, and that the subscript n in these equations refers to the number of customers in the system, not only in the queue.
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