الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
With the objective of studying the factors affect-i”19 the pe.-fonuance of maintenance evst the present work was carbed out using two types of simulation techniques.were theruathemnatical models and computer sLM .(machines, crews, spare parts) were studied separa¬.=:-I 0 From this spiked, some of the measures of the sy=stem
were presented, i.e., the mean waiting time are number of units that are in the system and that for or service, spare parts exchange value, utilization In conclusion to the research work carried out in the
sent thesis, by mathematical and computer simulation, it
possible to obtain values of both service factor leading system efficiency and utilization factor controlling.