الفهرس 
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Abstract
Queueing theory is a very rich branch of mathematics, operations
research, applied probability and have played an important and a vital
role, especially, in performance evaluation and modeling various real -
life systems dealing with congestion. In fact, it has revolutionized the
computer systems, industrial reliability, workforce management,
engineering biology, political sciences, biotechnology sciences, actuarial
sciences, biomedical studies, computer networks, public health sectors,
demography, traffic modeling, inventory models, telecommunication
systems and many more.
Queueing systems are particularly useful for the design of these
sciences in terms of layout, capacities, and control. The importance of
queueing theory lies not only in its applicability to real-life problem with
its computationally tractable procedures, but in the elegance and
completeness of the underlying stochastic models as well.
This thesis, which contains three chapters, investigates the quality
control (QC) procedure in two elementary queuing models in which the
feedback strategy and retention of reneged customers concept are
assumed correlated. In recent years, quality control (QC) and feedback
queues have emerged as an important areas of queueing theory. The
economic optimization analysis of each queueing model separately is
performed. The two queueing models are then investigated to obtain
greater insights regarding the mutual and join effects of quality control
(QC) and models’ design.