3 x Completion time: 1 Total direct cost: $2,000 se the information contained in

Question

3 x Completion time: 1 Total direct cost: $2,000 se the information contained in the tables below to compress one time unit per move using e least cost method. Reduce the schedule until you reach the crash point of the network. Crash cost Activity ID Normal co slope, S/day) Maximum Crash time Normal time 150 200 250 200 250 200 250 300 200 $2,000 B. 80 120 70 2 3 40 50 60 90 Total direct normal costs The indirect costs for each duration are $1,500 for 17 weeks, $1,450 for 16 weeks, $1,400 for 15 weeks, $1,350 for 14 weeks, $1,300 for 13 weeks, $1,250 for 12 weeks, $1,200 for 11

Explanation / Answer

The critical path is ABDHI

If we want to reduce the project time by crashing, we will need to crash one of these nodes. The slope for these activities are

A – N/A

B – 80

D – 70

H – 60

I – 90

We need to crash the activities that cost the least to crash. So we begin with H. Now H can only be crashed by maximum of 1 week. This means our project duration will become 16 weeks. However, we need to crash another one. This time choose D. This will make our project complete in 15 days.

Answer: crash D and H

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