Stochastic Shop Scheduling: A Survey

In this paper a survey is made of some of the recent results in stochastic shop scheduling. The models dealt with include: (i) Open shops. (ii) Flow shops with infinite intermediate storage (permutation flow shops). (iii) Flow shops with zero intermediate storage and blocking. (iv) Job shops. Two objective functions are considered: Minimization of the expected completion time of the last job, the so-called makespan, and minimization of the sum of the expected completion times of all jobs, the so-called flow time. The decision-maker is not allowed to preempt. The shop models with two machines and exponentially distributed processing times usually turn out to have a very nice structure. Shop models with more than two machines are considerably harder.

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