On the other hand several industries prefer to use systems design software suchas SAP-APO, IBM’s A-Team, etc., (Pinedo, 2002) and those generate their solutionbased on heuristics, relaxations or approximations different than queueing softwaresolutions. However, usually those approaches have limitations. Their performancechange based on certain settings and in general, user needs to complete several experimentsto determine the most suitable algorithm. Additionally computation speedbecomes one of the most important practical considerations. Instead of those all-inone,multi functional software designs, queueing software can provide quick andeasy solutions while covering dynamics and related effects but not higher levels ofsystem details (Suri et al, 1995)
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