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This case of a number of jobs to be processed on one facility is very common in real life situations. The of cars to be serviced in a garage, number of engines to be overhauled in one workshop, number of to be treated by one doctor, number of different jobs to be machined on a lathe etc are the cases can be solved by using the method under study. In all such cases we are all used to ‘first come first served’ principle to give sense of satisfaction and justice to the waiting jobs. But if this is not the consideration, it is possible to get more favourable results in the interest of effectiveness and efficiency. The following assumptions are applicable:-

a)     The job shop is static.

b)    Processing time of the job is known.

The implication of the above assumption that job shop is static will mean that new job arrivals do riot disturb the processing of n jobs already being processed and the new job arrivals wait to be attended to next batch.