## Question

###### 5. A firm that specializes in desktop publishing for local charities has agreed to take on...

5. A firm that specializes in desktop publishing for local charities has agreed to take on the following jobs. The firm has not decided which dispatching rule to apply in order to prioritize the jobs and fix them into the schedule. Please use the dispatching rules suggested in the following box and complete all the calculation needed in order to provide the performance measures asked in the box. Today's date is 5. Please keep two decimal points. Job 1 Job 2 Job 3 Job 4 Job 5 Process Time 20 15 7 25 31 Due Date 30 25 21 80 58 Dispatching Rule Average Flow Time Average Number of Jobs Job Sequence Average Lateness EDD SPT

## Answers

EDD= In EDD, the jobs will be arranged with the increasing due date

So the sequence will be=3,2,1,5,4

Job In Out Due Date lateness 3 0 7 21 0 2 7 7+15=22 25 0 1 22 22+20=42 30 12 5 42 42+31=73 58 15 4 73 73+25=98 80 18 Average flow time =(7+22+42+73+98)/5=48.4

Average number of jobs=(7+22+42+73+98)/(20+15+7+25+31)=2.47

Average lateness=(0+0+12+15+18)/5 =9

For SPT= Sequence = as per the increasing order to processing time =3-2-1-4-5

Job In Out Due Date lateness 3 0 7 21 0 2 7 7+15=22 25 0 1 22 22+20=42 30 12 4 42 42+25=67 80 0 5 67 67+31=98 58 40 Average flow time= (7+22+42+67+98)/5=47.2

Average number of jobs=(7+22+42+67+98)/(20+15+7+25+31)=2.41

Average lateness =(0+0+12+0+40)/5 =10.4

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