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Question 3: Project Crashing (21 marks)
a) Discuss the differences between CPM and PERT approaches for network analysis
Table 1
Activity
Predecessor
Normal
Crash
Normal
Crash
Crash
S
Time
Time
Cost ($)
Cost ($)
Cost/Day
(weeks)
(weeks)
($)
A
5
3
20 000
30 000
5000
B
2
10 000
20 000
10000
C
A
6
16 000
24 000
4000
D
A
6
3
25 000
43 000
6000
B
5
4
22 000
30 000
8000
F
B
7
4
30 000
48 000
6000
G
C,E
9
5
25 000
49 000
6000
H
D,F
8
6
30 000
44 000
7000
(b) Draw the above project network using the AON representation.
Determine the project paths and specify the critical path(s).
(d) Suppose that management wants to complete the project in 12 weeks to beat competition.
Which activities should be crashed, and for each crashed activity provide the total number of
weeks crashed and the total cost.
(e) What is the overall project crashing cost?

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