In this research, we investigate a biobjective project scheduling problem with fuzzy precedence relations. in order to consider biobjective and fuzzy precedence relations, we introduce a concept of scheduling vector and satisfaction level with respect to ambiguous precedence relations between tasks. We aim to find a non dominated schedules to maximize minimum satisfaction with respect to precedence relations between tasks and to minimize maximum tardiness for due-date of task, simultaneously.

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... efficient algorithm based on PERT technique is proposed and its validity and computational complexity are demonstrated.