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Unit 13: PERT, CPM and Time Estimation

crash. Hence, it is crashed. The project network after this crashing is shown in Figure 13.8. As per Notes
this Figure 13.8, the critical path is (1-2-4-6-7) with a duration of 2014 weeks and the total direct
cost is 56,400.

Figure 13.8: Project Network (6)

6 3
2 4 6

7
4
5 2

1 7
9
5
5
3 5

Looking at the new critical path (1-2-4-6-7) we find that the only non crashed activity is (4-6).
Crashing this gives us the project network shown in Figure 13.9. As per this Figure 13.9, the
critical path again is (1-2-4-6-7) with a duration of 191/2 weeks and the total direct cost is
57,600.
Figure 13.9: Project Network (7)

6 2
2 4 6
7
4
5
2

1 7

9
5
5
3 5

Since all the activities on the critical path (1-2-4-6-7) are crashed, there is no possibility of further
time reduction.

From Table 13.2, we find that the total cost is minimized for the project schedule represented by
the activities crashed are (1-2), (2-4), (3-5), (5-6), (6-7). The information provided in Table 13.2 is
useful for decision-making.

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