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Oliver Lehmann Question on Floats

Posted: Sun Mar 01, 2015 6:43 am
by smurthy
Hi
Please see the attached image file.
The related options are:
(a) Activity B has a free float of 10 days
(b) Activity B has a total float of 10 days.

Total float : the maximum amount of time an activity can be delayed from its early start without delaying the entire project
Free Float : the maximum amount of time an activity can be delayed without delaying the early start of any of its succeeding activities.

I chose option (a) but correct answer is indicated as (b).
Can anyone explain this.

Thanks
Narayana

Re: Oliver Lehmann Question on Floats

Posted: Sun Mar 01, 2015 12:40 pm
by signor_rk
hi Narayana,

This is the Q # 18 of Oliver F Lehmann's Q-75 Mock Test.

The Options are:
A. Activity B has a free float of 10 d.
B. Activity B has a total float of 10 d
C. Activity A has a free float of 10 d
D. Activity A has a total float of 10 d

Option # C & D can be removed straight way.
Now , out of Option # A & B :
The Free Float for Activity B = ES of Activity D - EF of Activity B -1 = 31 -21 -1 = 9 days
The Total Float for Activity B = LS of Activity B - ES of Activity B = 26 - 16 = 10 days

You may please refer to Page # 177 , Figure 6-18 PMBOK Guide Fifth Edition for the necessary concept.
So , the correct answer Option is Option # B. Activity B has a total float of 10 d

Hope this should be helpful.