While planning your project, you’ve compiled both normal and crash times and cos

Question

While planning your project, you’ve compiled both normal and crash times and costs for each project activity. Those times and costs are shown in the table below. After planning a project, you're told that you must reduce the project duration by 2 days.

a. If activities B, E, F, H, and J are on the critical path, which activity would you crash first? (5 pts) Why? (5 pts)

b. Assume that after reducing the project by one day (see previous question), your critical path remains the same (B, E, F, H, and J). With one day left to reduce, which activity would you crash second? (5 pts) Why? (5 pts)

Direct Costs Maximum Normal Crash Actviity ID Slope Crash TimeTime Time Cost 50 110 50 80 70 40 30 100 90 80 Cost 210 70 80 160 40 50 115 290 160 14 10 9 8 8 6

Explanation / Answer

Now

The critical tasks, slope max is to be saved.

BEFHG

As per the slope:

A.

So, J is the first to Crash.

B.

Using the same table from above.

Again J will be crashed as max crash time for the Activity is 2 days and so there is one more day that could be crashed from Activity J.

Cost(C-N)/Time(N-C) Time(N-C) Normal Crash Critical Activity Slope Max Crash time Time Cost Time Cost A 5 1 4 50 3 55 Yes B 25 4 14 110 10 210 C 10 2 7 50 5 70 D 0 6 80 6 80 Yes E 30 3 8 70 5 160 Yes F 0 2 40 2 40 G 20 1 2 30 1 50 Yes H 15 1 9 100 8 115 I 50 4 11 90 7 290 Yes J 40 2 8 80 6 160

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