Chapter 6 - Project Crashing
Chapter 6 - Project Crashing
Chapter 6 - Project Crashing
10-02
10-03
0
A
6
Spec Design
6
6
B
11
Design Check
5
Lag 4
15
C
22
Blueprinting
7
10-04
15
D
Wiring
6
21
10
A
16
Plumbing
6
Lag 3
16
B
HVAC
5
21
21
C
22
Inspection
1
10-05
30
D
Wiring
6
36
Lag 3
31
A
33
Plumbing
6
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33
B
HVAC
5
36
36
C
37
Inspection
1
10-06
36
22
A
28
Plumbing
6
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Lag 3
28
B
HVAC
5
33
33
C
34
Inspection
1
10-07
Gantt Charts
Establish a time-phased network
10-08
FIGURE 10.8
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10-9
FIGURE 10.9
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10-10
FIGURE 10.10
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FIGURE 10.11
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10-12
Crashing
The process of accelerating a project
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Managerial Considerations
Determine activity fixed and variable costs
The crash point is the fully expedited activity
10-14
Crashed
Activity
Duration
5 days
$ 1,000
3 days
$ 1,500
7 days
700
6 days
1,000
3 days
2,500
2 days
4,000
5 days
1,500
5 days
1,500
9 days
3,750
6 days
9,000
4 days
1,600
3 days
2,500
6 days
2,400
4 days
3,000
8 days
9,000
5 days
15,000
Total costs
Cost
$22,450
Duration
Cost
$37,500
Table 10.1
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10-16
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FIGURE 10.16 Relationship Between Cost and Days Saved in a Crashed Project
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nodes
Dummy activities may be required
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10-19
FIGURE 10.18
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10-20
FIGURE 10.19
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10-21
FIGURE 10.20A
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10-22
FIGURE 10.20B
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FIGURE 10.20C
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FIGURE 10.21
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FIGURE 10.22
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FIGURE 10.23
10-27
FIGURE 10.24
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Summary
1.
2.
3.
4.
5.
6.
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Crashing Example 1
Crashing Example 1
Cost per time period is =
Crashing Example 1
Activity A$ 6,000 per week
Crashing Example 1
Reduce Project duration to 17 weeks
Critical path ?
Lowest costs ?
Outcome
Project Duration = 17 weeks
Project Costs = $ 205,000
Crashing Example 1
Reduce Project duration to 16 weeks
Critical path ?
Lowest costs ?
Outcome
Project Duration = 16 weeks
Project Costs = $ 211,000
Crashing Example 1
Reduce Project duration to 15 weeks
Critical path ?
Lowest costs ?
Outcome
Project Duration = 15 weeks
Project Costs = $ 223,000
Crashing Example 2
Calculate the minimum extra costs if the project is to be speeded up to 12 weeks
B
8
13
13
11
13
13
13
13
E
5
18
18
laluan kritikal
8-37
Crashing Example 2
Jadual 5
Aktiviti
A
B
C
D
E
Normal
Duration
5
8
6
4
5
Normal
Cost ($)
2000
2500
3000
2000
1000
Crash
Duration
3
2
4
4
3
Crash
Cost ($)
2400
4500
4500
2000
3500
Rate
$/week
200
333
750
1250
Mix
compression
(weeks)
2
6
2
2
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Crashing Example 2
Ist compression
(crash A 1 minggu)
4
B
8
12
12
10
12
17
12
12
17
11
laluan kritikal
12
8-39
Crashing Example 2
(crash A 1 minggu)
3
B
8
11
11
11
D
7
7
4
11
11
16
16
laluan kritikal
11
8-40
Crashing Example 2
2nd compression
(crash B-1 minggu)
3
B
7
10
10
10
10
10
10
E
5
15
15
laluan kritikal
8-41
Crashing Example 2
(crash B-1 minggu)
B
6
9
9
14
14
laluan kritikal
8-42
Crashing Example 2
3rd compression
(crash B-1 minggu dan C-1 minggu)
B
5
E
5
13
13
laluan kritikal
8-43
Crashing Example 2
(crash B-1 minggu dan C-1 minggu)
3
B
4
7
7
E
5
12
12
laluan kritikal
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Crashing Example 2
Jadual 6
Pendekkan A
Pendekkan B
Pendekkan B, C
Jumlah
Masa dijimat
(minggu)
Kos
tambahan/minggu
Duration
(minggu)
400
666
2166
3232
2
2
2
200
333
1083
16
14
12
8-45