Preemptive resource constrained project scheduling problem with uncertain resource availabilities: Investigate worth of proactive strategies

Resource constraint project scheduling problem under stochastic circumstances have been considered in recent decades where uncertainty is modeled by means of activities' duration. In this paper we study an extension of basic stochastic RCPSP in which uncertainty come to play on resource availabilities. We have also pursued preempt-resume mode in case of activities breakdown due to resource infeasibility. A solution for this variant of RCPSP is defined in two steps by utilizing heuristic procedures for creating initial schedule and adding time and resource buffers in order to yields proactive schedule to cope with adverse effects of uncertainties. Numerical results revealed that proposed procedure yields significant performance gains over the ignorance of proactive strategies.