Using the FCFS rule for scheduling, the sequence is 1-2-3. For the schedule deve

Question

Using the FCFS rule for scheduling, the sequence is 1-2-3. For the schedule developed using the FCFS rule, the total length of time taken to complete the three suits (including delivery) = 22 hours (enter your response as a whole number). Using Johnson's rule for 2-machine scheduling, the sequence is 3-2-1. For the schedule developed using the Johnson's rule, the total length of time taken to complete the three suits (including delivery) = hours (enter your response as a whole number). Sunny Park Tailors has been asked to make three different types of wedding suits for separate customers. The table below highlights the time taken in hours for cutting and sewing (process 1) and delivery (process 2) of each of the suits. Assume that orders for suits have been listed in the above table in the order in which they were received.

Explanation / Answer

Johnson's Rule is: Step 1 From the list of unscheduled jobs, select the one with the shortest processing time in either work center. Step 2 If the shortest time is at the first work center, the job is performed first in the schedule otherwise the last job is performed in the schedule. Step 3 The job assigned in Step 2 is eliminated from the list of unscheduled jobs. Step 4 Steps 1,2 and 3 are reapeated in filling in the schedule from the front and the back until all jobs have been scheduled. Cumulative Time Calculation Job 3 2 1 Cut and Sew 5 9 16 Deliver 11 12 18 Hence, the answer is 18 hours. Operator 2 can start job only if Operator 1 can completed the job

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