Production scheduling are in general carried out hierarchically from long-term plans to short-term plans, and scheduling tasks are executed by different persons and/or organizations concurrently. Therefore, an effective computerized support is eagerly required to change the schedules, and to keep the consistency among the hierarchical scheduling tasks, when some unforeseen disruptions occur to the manufacturing systems. The objectives of the research are to establish a systematic method for supporting the rescheduling tasks and keeping the consistency among the various layers of schedules of the hierarchical and decentralized manufacturing systems. Models for the hierarchical production schedules are proposed, and rescheduling procedures are also developed based on the models. A rescheduling method is proposed to change the schedules, and to keep the consistency among the schedules. A prototype for hierarchical and concurrent rescheduling system is developed and applied to the consistency management problems in the hierarchical rescheduling tasks.
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