A Multi-Heuristic GA for Schedule Repair in Precast Plant Production

Weng-Tat Chan and Tan Heng Wee

A multi-heuristic schedule repair model for schedule conflict resolution is presented and its application in repairing the schedules of a prefabrication plant is described in this paper. The model combines heuristic strategies with Genetic Algorithms to repair schedules with resource constraints. The GA determines the "best" sequence of resolving schedule disturbances using heuristic rules selected from a library of heuristics commonly used in industry. We compare quantitatively the advantages of using this model for schedule repair against existing singleheuristic schedule repair techniques with a multi-criteria evaluation function. Results on the macroscopic and microscopic levels are presented to understand the strengths and weaknesses of the model.

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