Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Chapter 14, Problem 13P
Summary Introduction
Interpretation: Critical ratio for the job alpha which requires 2 weeks of work and is due in 4 weeks.
Concept Introduction:
Critica ratio refers to the rule that merges the issue of due date and processing time together into one single value used to settle through the waiting jobs. It is also considered as a dynamic priority rule, in which the value changes as time passes, hence, the
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Using Johnson's rule for 2-machine scheduling, the sequence is:
Scheduled Order
Job
1
▼
B
C
E
F
A
D
Part 2
2
▼
F
C
A
D
B
E
Part 3
3
▼
A
B
D
F
C
E
Part 4
4
▼
E
D
C
B
F
A
Part 5
5
▼
F
C
D
A
E
B
Part 6
6
▼
D
C
F
B
E
A
Part 7
For the schedule developed using Johnson's rule, the total length of time taken to complete the six jobs (including the 2nd operation) =
enter your response here
hours (enter your response as a whole number).
...
Question content area right
Part 1
Six jobs are to be processed through a two-step operation. The first operation involves sanding, and the second involves painting. Processing times are as follows:
Job
Operation 1 (hours)
Operation 2 (hours)
A
4
8
B
10
5
C
3
11
D…
If the time remaining to complete a job is 10 days and the lead time remaining is 12 days, whatis the critical ratio? Is the order ahead of schedule, on schedule, or behind schedule?
First Printing and Copy Center has 4 jobs to be scheduled. Production scheduling personnel are reviewing the Gantt chart at the end of day
4.
Job
D
was scheduled to begin early on day
2
and take
7.5
days. As of now (the review point after day
4),
it is 2 days ahead of schedule.
Job
E
should begin on day
1
and take
4
days. It was on time.
Job
F
was to begin on day
2,
but maintenance forced a delay of
0.5
day.
The job should now take
5
full days. It is now on schedule.
Job
G
is a day behind schedule. It started at the beginning of day
2
and should require
7
days to complete.
Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted as blue lines).
Using the line drawing tool, plot the actual progress showing the actual start and the expected finish on top of (overlapping) the maroon dashed line provided just above the job number for each of the tasks.
Chapter 14 Solutions
Practical Operations Management
Ch. 14 - Prob. 1DQCh. 14 - Prob. 2DQCh. 14 - Prob. 3DQCh. 14 - Prob. 4DQCh. 14 - Prob. 5DQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 6P
Ch. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 18PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 26PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 1.1QCh. 14 - Prob. 1.2QCh. 14 - Prob. 1.3QCh. 14 - Prob. 1.4Q
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