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In this research paper a comparative study has been made of tardiness based existing as well as new dispatching rules. Mean tardiness, maximum tardiness and the number of tardy jobs objectives have been used to evaluate the performance of each dispatching rule. Several experimental parameters related to shop loading levels, breakdown levels and mean time to repair are taken into consideration to analyse the effect of these parameters on the performance of the various dispatching rules. Simulation results indicate that shop loading, breakdown level and mean time to repair are important parameters for the selection of an appropriate rule in a shop.

Tardiness based new dispatching rules for shop scheduling with unreliable machines