Float question from time management
Submitted by cplusplus on Tue, 02/09/2010 - 13:05
The earliest Task C can finish is January 21, and the earliest the next task can start is January 28. From this information we can be sure that:
A. Task C has 6 days of float
B. Task C has 6 days of free float
C. Task C has 7 days of free float
D. Task C has 7 days of float
Please also briefly explain the choice.
Thank you all.
Forums:
pkukilla
Tue, 02/09/2010 - 16:44
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Answer is C
Free Float is the amount of time activity (C) can be delayed without delaying the early start date of next task.
or Free Float= Early start date of successor activity- Early start date of precessedor activity
Free Float= 28-21=7.
You can follow the below link for more details regarding free float
http://www.deepfriedbrainpmp.com/2009/08/total-free-float-cpm-network-diagram.html
ChandraR
Tue, 02/09/2010 - 17:59
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Answer is B
Float of 'C' = Earliest start of Subsequent task-Earliest Finish of C - 1
= 28-21-1= 6 days
By Jan. 27, C must be finished so next Activity 'D' can start on Jan. 28. Even if you look at : Float = LF-EF= 27-21=6 days is the maximum relaxing period you get.
Another way to look at is: You can finish as early as Jan. 21. So Jan 22, 23, 24, 25, 26, 27 ( 6 days) are your spare days without causing delay to start the next activity on Jan. 28.
Chandra
cplusplus
Wed, 02/10/2010 - 15:52
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Float question from time management
Chandra, Your answer is right.
Even i made a mistake picking 7 days of free float.
6 Days free float is right.
Thank you for the explanation.