Integrated Project Scheduling and Material Planning with Variable Activity Duration and Rewards.

Audit scheduling with overlapping activities and sequence dependent setup cost has not been treated in literature. This paper presents a formulation and a solution approach for this audit scheduling problem. In this paper, we treat the activity duration as a decision variable and include granting a reward for completing the project ahead of its due date. We show that these two changes lead to further reduction in the project total cost and may also lead tot a reduction in the project duration.