Big Dan's Machine Shop is considering the use of a priority scheduling rule in the fabrication shop and

must decide whether to use: (1) critical ratio (CR), (2) earliest due date (EDD), (3) shortest operation next

(SON), or (4) order slack. The current shop status of the company is given here:

Order Number

1

2

3

4

5

Total Remaining

Manufacturing Time

18

12

10

15

20

Time Remaining

until Due Date

12

15

14

18

15

Current Operation

Processing Time

8

5

6

7

6

a. Using the four sequencing rules, compute the scheduling priority for each order given in the table above.

b. What order should be run first under each of these scheduling rules?