CSM Forum Banner

Crashing question

Discuss PMP doubts, tips and lesson learned. iZenBridge makes PMP® Certification easy
coolpmp69
Contributor
Contributor
Posts: 282
Joined: Mon Nov 17, 2014 8:55 pm

Crashing question

Postby coolpmp69 Tue Feb 17, 2015 10:13 pm

5 tasks have to be completed one after another in your project. The contract with sponsor contains very strict penalties for project delay. The schedule reveals that the project has a negative float of 3 months. Which of the following task(s) should be crashed to bring the project on schedule? Refer to the table in the attachment

Options:
1. Task Q
2. Task N and Task O together
3. Either Task Q or Task N and Task O together
4. Task P and Task N together
------------------------

My take on this question : I compared the crash cost and months saved
The crashing costs and months saved for the given options are :
1. task q = $ 2650 ; 3 months saved
2. task N and task O together= $3950 ; 3 months saved
3. Either Task Q or Task N and Task O together = $2650/$3950 ; 3 months saved
4. Task P and Task N together = $5100 ; 3 months saved

All the above options save 3 months which is good to eliminate negative float. Thus based on the cost the option 1 Task Q should be crashed.

Experts opinion needed here.
Attachments
table.jpg
table.jpg (60.18 KiB) Viewed 1103 times
signor_rk
Contributor
Contributor
Posts: 182
Joined: Wed Jun 18, 2014 3:47 pm

Re: Crashing question

Postby signor_rk Wed Feb 18, 2015 10:57 am

Let us calculate the additional cost required (= Crash Cost - Original Cost) to recover the negative float of 3 (three) months by CRASHING.

Options:
1. Task Q => $ 150
2. Task N and Task O together => ($100 + $50) = $150
3. Either Task Q or Task N and Task O together => $150 each
4. Task P and Task N together => ($200 + $100) = $300

Now , the Options # 1 , 2 & 3 are correct , but Option # 3 gives us the BEST choice as we find 2(two) options for selection.

Therefore , the Correct answer Option is Option # 3. Either Task Q or Task N and Task O together
Regards ,

Ranjit
coolpmp69
Contributor
Contributor
Posts: 282
Joined: Mon Nov 17, 2014 8:55 pm

Re: Crashing question

Postby coolpmp69 Wed Feb 18, 2015 1:48 pm

Ranjit, Agree with your additional cost calculation but if you see the crashing cost for option 3 it is either $2650 or $3950 (based on my calculation) then why would one pick option 3 than option1?
Based on PMBOK glossary : "Crashing is a technique used to shorten the schedule duration for the least incremental cost by adding resources"
so I still think option 1 is the best one.
coolpmp69
Contributor
Contributor
Posts: 282
Joined: Mon Nov 17, 2014 8:55 pm

Re: Crashing question

Postby coolpmp69 Fri Feb 20, 2015 1:55 pm

Any additional thought on this question?
User avatar
saket
Site Admin
Site Admin
Posts: 3125
Joined: Sat Dec 07, 2013 10:37 pm

Re: Crashing question

Postby saket Sun Feb 22, 2015 2:49 am

I feel we should not spend too much time in eliminating options in such questions, we should understand how to calculate the crash cost, and in exam i do not expect we get same crash cost in more than one options. If that happen we need some additional information like risk etc to judge which one should be picked.
Explore our online PMP Program , it makes PMP Easy :-) http://goo.gl/ZmD3xF

Image Image Image Image

Return to “PMP® Open Forum”

Who is online

Users browsing this forum: No registered users and 8 guests