Five welding jobs are waiting to be processed. Their processing times and due dates are given below. Using the critical ratio dispatching rule, in which order should the jobs be processed Job Processing Time (days) Job due date (days)
A 4 7
B 2 4
C 8 11
D 3 5
E 5 11

Order of processing the jobs:

Job   Critical Ratio

C          1.375

D          1.667

A          1.75

B          2.0

E          2.2

Explanation:

a) Data and Calculations:

Job      Processing      Job due       Critical

          Time (days)     date (days)      Ratio

A                4                    7                1.75 (7/4)

B                2                    4                2.0 (4/2)

C               8                    11                1.375 (11/8)

D               3                    5                1.667 (5/3)

E               5                    11                2.2 (11/5)

b) The critical ratio (CR) dispatching indicates the priority sequencing that should be adopted to process work at a work center. The first process is to create the CR priority index number, which is obtained from the formula of due days divided by the processing days. Therefore, the job with the lowest CR is scheduled first.

1. c

2. b

3. a

4. c

5. a

6. b

7. c

8. c

9.b

10. d

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