29) Use the information in Table 10.10. What is the average past due (in days) using the EDD rule?
A) fewer than or equal to 2 days
B) greater than 2 days but fewer than or equal to 3 days
C) greater than 3 days but fewer than or equal to 4 days
D) greater than 4 days
30) Use the information in Table 10.10. What is the average flow time (in days) using the FCFS rule?
A) fewer than or equal to 10 days
B) greater than 10 days but fewer than or equal to 20 days
C) greater than 20 days but fewer than or equal to 30 days
D) greater than 30 days
31) Use the information in Table 10.10. What is the average flow time (in days) using the EDD rule?
A) fewer than or equal to 10 days
B) greater than 10 days but fewer than or equal to 20 days
C) greater than 20 days but fewer than or equal to 30 days
D) greater than 30 days
32) ________ is the amount of time a job spends in the service or manufacturing system.
33) ________ is the amount of time by which a job missed its due date.
34) A(n) ________ graphically displays the load on a productive resource of interest, i.e., when it is busy
and when it is idle.
35) A hospital must have a skeleton crew on hand during the undesirable work period from midnight to
8 o’clock. One way to make sure that all employees have the opportunity to work this shift is by adopting
a(n) ________.
36) A(n) ________ seeks to optimize resources across the supply chain and align daily operations with
strategic goals.
37) How do Gantt charts assist schedulers in arriving at feasible schedules?
54
38) What is a Gantt chart? What does Gantt stand for?
Answer: Gantt charts come in two flavors; the progress chart and the workstation chart. The progress
chart shows the current status of jobs already in progress in the shop. The workstation chart shows the
39) Imagine you are the owner/operator of a custom printing business. One morning you arrive at work
and discover you have five customer orders that have different requirements and different total
processing times. You ponder the sequence for a while and then decide to run the printing jobs in first–
come, first-served order. What are some measures you could apply to your performance to measure
whether you have done a good job? How is each measure calculated?
Answer: The two measures discussed in the text are flow time and past due. These values can be
calculated for each customer order and then an overall average flow time and average past due can be
40) What does an advanced planning system do and what are the functions of the major components?
Answer: An advanced planning system (APS) optimizes resources across the supply chain and aligns
daily operations with strategic goals. The systems typically have these components: demand planning,
55
41) Jim’s Restaurant operates seven days a week. The daily requirements (in workers) are estimated as
follows:
Each worker is required to work five days per week, and each must have two consecutive days off. What
is the minimum number of workers needed? Provide the days off that each worker receives.
Answer:
42) Wally‘s Bar operates seven days a week. The daily requirements (in workers) are estimated as follows:
Each worker is required to work five days per week, and each must have two consecutive days off. What
is the minimum number of workers needed? Provide the days off that each worker receives.
Answer:
56
43)
Job
Process
Time (days)
Due Time
(days)
Days Since
Arrival
A
2
7
12
B
8
16
9
C
4
4
8
D
10
17
5
E
5
15
3
F
12
18
2
Use the information in the preceding table and sequence the six jobs using FCFS and EDD. The jobs are
listed in the order of their arrival. Calculate the average flow time and average past due. It is now time
zero.
Answer:
Average Flow Time = 159 ÷ 6 = 26.5
Average Days Past Due = 54 ÷ 6 = 9.0
57
44)
Job
Process
Time
Due Date
Days Since
Arrival
A
5
7
11
B
9
5
9
C
7
9
9
D
2
3
7
E
3
4
5
F
8
8
2
Use the information in the preceding table and sequence the six jobs using first come, first served (FCFS)
and earliest due date (EDD). Calculate the average flow time and average past due. It is now time zero.
Answer:
58
45)
Job
Days Since
Arrival
Process
Time
Due Date
Hepner
0
7
1
Cheng
4
2
3
Allison
1
8
10
Miller
2
8
10
Dickson
4
12
11
Noel
5
16
2
Bahouth
4
16
3
Use the information in the preceding table and sequence the seven jobs using first come, first served
(FCFS) and earliest due date (EDD). Calculate the average flow time and average past due. It is now time
5.
59
Answer: The FCFS sequence is:
Job
Day
Arrived
Process
Time
Due
Date
Order
FINISH
Days Waiting to
Day 5 start of
Processing
Flow
Time
Late
Hepner
0
7
1
first
11
incl in Finish
11
10
Allison
1
8
10
second
19
3
16
9
Miller
2
8
10
third
27
4
23
17
Cheng
4
2
3
fourth
29
1
28
26
Dickson
4
12
11
fifth
41
1
40
30
Bahouth
4
16
3
sixth
57
1
56
54
Noel
5
16
2
seventh
73
0
73
71
The EDD sequence is:
Job
Day
Arrived
Process
Time
Due
Date
Order
FINISH
Days Waiting to
Day 5 start of
Processing
Flow
Time
Late
Hepner
0
7
1
first
11
incl in Finish
11
10
Noel
5
16
2
second
27
0
27
25
Cheng
4
2
3
third
29
1
28
26
Bahouth
4
16
3
fourth
45
1
44
42
Allison
1
8
10
fifth
53
3
50
43
Miller
2
8
10
sixth
61
4
57
51
Dickson
4
12
11
seventh
73
1
72
62
60
46)
Job
Arrival
Date
Process
Time
Due Date
Hepner
0
17
12
Cheng
2
15
10
Allison
1
2
14
Miller
3
8
13
Dickson
4
13
17
Noel
5
12
9
Bahouth
6
16
8
Use the information in the preceding table and sequence the seven jobs using first come, first served
(FCFS) and earliest due date (EDD). Calculate the average flow time and average past due. It is now time
eight.
61
Answer: The FCFS sequence and results are:
Job
Arrival
Date
Process
Time
Due
Date
Order
FINISH
Days Waiting to
Day 8 start of
Processing
Flow
Time
Late
Hepner
0
17
12
first
24
incl in Finish
24
12
Allison
1
2
14
second
26
6
20
12
Cheng
2
15
10
third
41
5
36
31
Miller
3
8
13
fourth
49
4
45
36
Dickson
4
13
17
fifth
62
3
59
45
Noel
5
12
9
sixth
74
2
72
65
Bahouth
6
16
8
seventh
90
1
89
82
The EDD sequence and results are:
Job
Arrival
Date
Process
Time
Due
Date
Order
FINISH
Days Waiting to
Day 8 start of
Processing
Flow
Time
Late
Bahouth
6
16
8
first
23
incl in Finish
23
15
Noel
5
12
9
second
35
2
33
26
Cheng
2
15
10
third
50
5
45
40
Hepner
0
17
12
fourth
67
1
66
55
Miller
3
8
13
fifth
75
4
71
62
Allison
1
2
14
sixth
77
6
71
63
Dickson
4
13
17
seventh
90
3
87
73