This post is not going to be presented in german ( sorry Robert ! ) but in english, because I want everyone to understand it. A very similar question come up on my PMP exam ...
Question : "Consider the information below, in which activities A, B, and D are on one path and must be performed in the sequence, and activity C is to be performed parallel to that path. Assuming cost is important, in which sequence should crashing of activities be planned ?
Normal Time : A=4, B=3, C=5, D=5
Crash Time : A=2, B=2, C=4, D=3
Normal Cost : A=10, B=20, C=14, D=25
Crash Cost : A=11, B=22, C=16, D=27
( Time in weeks and amounts on thousand of dollars )
First of all, Task C is not on the critical path and does not really need to be crashed. The answer is B ( A, D, B ) because :
A: 4-2 = 2 weeks crash => 1K$ increase => 0,5K per week
B: 3-1 = 1 week crash => 2K$ increase => 2K per week
D: 5-3 = 2 week crash => 2K$ increase => 1K per week
So, first you choose A, because it provides you with the best crashing time at the lower cost. Then you have to choose between D and B. If you have to choose sequentially and cost is important, I would choose D because it provides you the most crash time at the lower cost.
This is a tricky question. I'm not quite sure I got it right. I'm 99,999 % sure .... LOL ! Feedback is deeply appreciated.
It's because of this type of questions that I say it's no use studying too much for this certification ... ;)
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