Question

A foreman has determined processing times at a work center for a set of jobs and now wants to sequence them. Given the information shown, do the following:
Job Job Time (Days) Due Date Operations Remaining
A 4.5 10 3
B 6.0 17 4
C 5.2 12 3
D 1.6 27 5
E 2.8 18 3
F 3.3 19 1
a. Determine the processing sequence using (1) FCFS, (2) SPT, (3) EDD, and (4) CR. For each sequence, compute the average job tardiness, the average flow time, and the average number of jobs at the work center. The list is in FCFS order.

Answer 1

a.

FCFS: A, B, C, D, E, F

Average job tardiness: 17.3

Average flow time: 14.3

Average number of jobs at the work center: 3.5

SPT: D, E, F, A, B, C

Average job tardiness: 16.9

Average flow time: 14.7

Average number of jobs at the work center: 3.5

EDD: F, E, A, C, B, D

Average job tardiness: 14.5

Average flow time: 13.9

Average number of jobs at the work center: 3.0

CR: E, F, A, D, C, B

Average job tardiness: 16.2

Average flow time: 13.6

Average number of jobs at the work center: 3.0

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