Homework Answers
The parameters that are asked for will depend on the heuristic selected. Some of the heuristics are shown below:
First Come First Serve (FCFS)
| Car | Processing time | Promised date | Start | Finish | Flow time | Tardiness |
| 1 | 3 | 5 | 0 | 3 | 3 | 0 |
| 2 | 2 | 6 | 3 | 5 | 5 | 0 |
| 3 | 1 | 9 | 5 | 6 | 6 | 0 |
| 4 | 4 | 11 | 6 | 10 | 10 | 0 |
| 5 | 5 | 8 | 10 | 15 | 15 | 7 |
| Average | 7.8 |
So,
Average flow time = 7.8 days
Maximum tardiness = 7 days
Number of tardy jobs = 1
Shortest Processing Time first (SPT)
| Car | Processing time | Promised date | Start | Finish | Flow time | Tardiness |
| 3 | 1 | 9 | 0 | 1 | 1 | 0 |
| 2 | 2 | 6 | 1 | 3 | 3 | 0 |
| 1 | 3 | 5 | 3 | 6 | 6 | 1 |
| 4 | 4 | 11 | 6 | 10 | 10 | 0 |
| 5 | 5 | 8 | 10 | 15 | 15 | 7 |
| Average | 7 |
So,
Average flow time = 7 days
Maximum tardiness = 7 days
Number of tardy jobs = 2
Earliest Due Date first (EDD)
| Car | Processing time | Promised date | Start | Finish | Flow time | Tardiness |
| 1 | 3 | 5 | 0 | 3 | 3 | 0 |
| 2 | 2 | 6 | 3 | 5 | 5 | 0 |
| 5 | 5 | 8 | 5 | 10 | 10 | 2 |
| 3 | 1 | 9 | 10 | 11 | 11 | 2 |
| 4 | 4 | 11 | 11 | 15 | 15 | 4 |
| Average | 8.8 |
So,
Average flow time = 8.8 days
Maximum tardiness = 4 days
Number of tardy jobs = 3
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