Page 224 - DMGT521_PROJECT_MANAGEMENT

Unit 13: PERT, CPM and Time Estimation

The project network with normal duration is shown in Figure 13.3. Notes
The critical path in the all normal network is (1-2-4-6-7). The project duration is 30 weeks and the
total direct cost is 45,200.

Figure 13.3: Project Network (1)

Examining the time cost slope of activities on the critical path we find that activity (2-4) has the
lowest slope; in other words, the cost to expedite per week is the lowest for activity (2-4). Hence
activity (2-4) is crashed. The project network after such a crashing is shown in Figure 13.4.
Figure 13.4: Project Network (2)

6 3
4 6
2
10
8
5 6

1
7
9
5
3 5
7
As per Figure 13.4 the critical path is (1-2-5-6-7), with a length of 29 weeks, and the total direct
cost is 46,700.

Figure 13.5: Project Network (3)

6 3
2 4 6
10
8
5 2

1 7
9
5
7
3 5

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