6. 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 Total Remaining Time Remaining Current Operation Number Manufacturing Time until Due Date Processing Time 1 15 12 8 2 12 15 5 3 10 14 4 4 15 18 3 5 20 19 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?