Average Average Average Number of Maximum
Flowtime Lateness Tardiness Tardy Jobs Tardiness
Number of Jobs 6 617.5 147.5 147.5 5 430
Job Processing Time Due Date Sequence
Processing Time
Due Date Flowtime Lateness Tardiness
1240 240 1240 240 240 0 0
2130 360 2130 360 370 10 10
3210 480 3210 480 580 100 100
490 240 490 240 670 430 430
5170 720 5170 720 840 120 120
6165 780 6165 780 1005 225 225
1. Compute the average flow time, lateness, and tardiness for this group of jobs using Ms.
Cheshire’s sequential order of 1 (first), 2, 3, 4, 5, and 6 (last).
Illustrative Solution:
Therefore, the average flowtime is 617.5 minutes per job; average lateness and tardiness of
147.5.
2. In what order would the jobs be processed using the SPT rule? Compute the average flow
time, lateness, and tardiness for this group of jobs.
The order that would jobs be processed using the SPT rule is from the number of job
