The objective of this paper is to calculate the completion time of various network paths according to which project completion time could be calculated. Critical Path Method (CPM) is used to determine project completion time if the time to conduct activities is definite. But if time of conducting activities is probable, Program Evaluation and Review Technique (PERT) method must be used and if occurring activities is possible, Graphical Evaluation and Review Technique (GERT) method should be applied. The current project control software usually cannot perform calculations for the last two states. Moreover, using manual methods is impossible if the network is composed of several activities. Thus applying the simulation approach is an appropriate method in such states. Simulation is used as a strong tool to analyze systems because it has a close relationship with real systems and considers many complicated relations in them.
It is intended to determine project completion time and critical path in this survey given that time of activities is probable and each activity is the prerequisite to another. ARENA software has been used to do so which is based on simulation method.
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