![]() This review makes an attempt to bring this out. If one looks at the general picture of the developments in these areas it is hard not to conclude that, in spite of the practitioners' accusations, the systems studied have become more and more realistic over the years. This paper reviews some of the major strides taken by Queueing Theory with respect to its three constituent problems: (i) Behavioral, (ii) Statistical, and (iii) Operational. and practitioners by putting things in proper perspective. It is hoped that a discussion of the problems, achievements and the shortcomings of Queueing Theory will be helpful for both theorists. In view of this, it seems that after six decades of development it is time for stock taking. Some practitioners feel that there is very little in it for use. Some theoreticians say that Queueing Theory is closed. Queueing Theory has been attacked on two fronts.
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