To calculate freefloat
 harin4627
 Participant
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Re: To calculate freefloat
Free Float: Predecessor activity can be delayed without affecting the early start date of successor activity. Here A can be delayed by 2 days without affecting the successor activity E (E starts after 7 days since depended on finish of B). So free float is 2 days. Am I correct?
Post
Re: To calculate freefloat
I've araised the same no. as 2. But as per source, it says that Free Float for Activity A is '0'. I got confused.
 sunku65
 Contributor
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Re: To calculate freefloat
Which Activities shares common successor activity has Free Float.
Toal 8 paths (not mention here, only critical path)
Crinical Path = STARTBDGHFinish= 24 days
Free float is different from Float/Slack
Activities Float/Slack of B,D,G,H = 0 (on critical path)
No Activities has Float/Slack.
Activity A's free float = ES of EEF of A1 = 851= 2 days on path StartAEF...
Activity F's Free float = ES of H  EF of F 1= 21161=4 days on path ....FHFinish
Activity C's Free Float = ES of I  EF of C 1=1791 = 7 days on path StartACIFinish
Activity E's Free Float = ES of F  EF of E 1=14121 = 1 day on path ...FHFinish
Toal 8 paths (not mention here, only critical path)
Crinical Path = STARTBDGHFinish= 24 days
Free float is different from Float/Slack
Activities Float/Slack of B,D,G,H = 0 (on critical path)
No Activities has Float/Slack.
Activity A's free float = ES of EEF of A1 = 851= 2 days on path StartAEF...
Activity F's Free float = ES of H  EF of F 1= 21161=4 days on path ....FHFinish
Activity C's Free Float = ES of I  EF of C 1=1791 = 7 days on path StartACIFinish
Activity E's Free Float = ES of F  EF of E 1=14121 = 1 day on path ...FHFinish
 M L Dahima
 Contributor
Post
Re: To calculate freefloat
please refer attached calculation.Free float for A is Nil.
EF for A is 5 and ES for C is 6.C has to start next day because there is FS relationship between A &C.
But if you talk about just float for A then this is 7.
Saket, Any comment on this understanding pl.
thanks
EF for A is 5 and ES for C is 6.C has to start next day because there is FS relationship between A &C.
But if you talk about just float for A then this is 7.
Saket, Any comment on this understanding pl.
thanks
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 saket
 Site Admin
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Re: To calculate freefloat
I just looked at the diagram made by ML Dahima , and its clear A is having Zero Free Float... free float are usually seen when the successor activity is also depended on something else then this predecessor.
If the relationship between A and C was not present then A could have free float
If the relationship between A and C was not present then A could have free float
 harin4627
 Participant
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Re: To calculate freefloat
good lesson for me...don't jump into conclusion without considering multiple relationships....I completely ignored ac relationship. always better to draw complete diagram with forward and backward passes and answer
 sunku65
 Contributor
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Re: To calculate freefloat
I drawn same as Dhaima.
Din't get a chance to post in time.
Its confusing free float.
Hi Dhaima
Can you tell me one thing Activity A's early finish is 5 then the successor activity E's Early start is 8.
In this case the activity A has to wait 2 days, then start on 8th day on activity E, Is it not free float of Activity A.
Can you tell me any activities has free float other than Activity A. Then, i will figure it out where i am going mistake.
Thanks,
Lax
Din't get a chance to post in time.
Its confusing free float.
Hi Dhaima
Can you tell me one thing Activity A's early finish is 5 then the successor activity E's Early start is 8.
In this case the activity A has to wait 2 days, then start on 8th day on activity E, Is it not free float of Activity A.
Can you tell me any activities has free float other than Activity A. Then, i will figure it out where i am going mistake.
Thanks,
Lax
 namita
 Super Member
Post
Re: To calculate freefloat
@Lax,
Just to answer your question, A is connected to both E and C. We can't decide on A's free float by only looking at E. All the successor activities has to be considered and there should not be any successor activity which is starting the very next day.
Activity E and C are having free float because there is only one successor activity for both and ES for that is later than next day of EF of E/C activity.
Feel free to ask any further question
ML is our Critical path & float KING
Just to answer your question, A is connected to both E and C. We can't decide on A's free float by only looking at E. All the successor activities has to be considered and there should not be any successor activity which is starting the very next day.
Activity E and C are having free float because there is only one successor activity for both and ES for that is later than next day of EF of E/C activity.
Feel free to ask any further question
ML is our Critical path & float KING
 sunku65
 Contributor
Post
Re: To calculate freefloat
Thank God!
I got cleared every thing on Free Float.
At least, 50% free float activities correctly solved ( i.e. C and E ) by me in above posted reply.
Thanks namitha,
Best regards,
Lax
I got cleared every thing on Free Float.
At least, 50% free float activities correctly solved ( i.e. C and E ) by me in above posted reply.
Thanks namitha,
Best regards,
Lax
Post
Re: To calculate freefloat
adding comments to further discussion...
Since A is connected to both E and C, whether we should consider Maximum ES of E & C  to calculate Free float of A
Since A is connected to both E and C, whether we should consider Maximum ES of E & C  to calculate Free float of A
 sunku65
 Contributor
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Re: To calculate freefloat
Finally the Activity Which one has totally rest before ES of successor activity all the way(even single or multiple ways).
 sunku65
 Contributor
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Re: To calculate freefloat
Hi Dahima and Saket,
Again i got question. Can you clear any one of them regarding free float.
In another website saying different(please refer fully) including comments):
http://pmstudycircle.com/2013/03/total ... reefloat/
I questioned in that forum on 9th may. i got the answer from the admin as follows:
Activity has two successor activity, it have a free float only for one path which has larger early start date.
Finally, which method need to follow.
Thanks,
Lax
Again i got question. Can you clear any one of them regarding free float.
In another website saying different(please refer fully) including comments):
http://pmstudycircle.com/2013/03/total ... reefloat/
I questioned in that forum on 9th may. i got the answer from the admin as follows:
Activity has two successor activity, it have a free float only for one path which has larger early start date.
Finally, which method need to follow.
Thanks,
Lax
 namita
 Super Member
Post
Re: To calculate freefloat
Dear Lax,
As per PMBOK (r)..
As per PMBOK (r)..
I would like to emphasis on ANY part of this definitionfree ﬂoat—the amount of time that a schedule activity can be delayed without delaying the early start date of any successor or violating a schedule constraint—can also be determined
 sunku65
 Contributor
Post
Re: To calculate freefloat
HI Namita,
free ﬂoat—the amount of time that a schedule activity can be delayed without delaying the early start date of any successor or violating a schedule constraint—can also be determined.
Compare this to our Network Diagram:
In case Activity A:
The amount of time(2 days) that a schedule activity (A) can be delayed (on ..EF..Path) without delaying the early start date of any successor (C).
Please Can you clarify!
Thanks,
Lax
free ﬂoat—the amount of time that a schedule activity can be delayed without delaying the early start date of any successor or violating a schedule constraint—can also be determined.
Compare this to our Network Diagram:
In case Activity A:
The amount of time(2 days) that a schedule activity (A) can be delayed (on ..EF..Path) without delaying the early start date of any successor (C).
Please Can you clarify!
Thanks,
Lax
 sunku65
 Contributor
 namita
 Super Member
Post
Re: To calculate freefloat
Dear Lax,
To understand this, think a practical situation. E.g. you have an activity to gather requirement (Say Activity A) and 2 following activities Analysis (C) and Design (E) which can start after A is completed. However the relationship is such that analysis has to start immediately after requirements are gathered where as Design can be started 2 days later
In this scenario, is there any chance you can delay completion of your requirement gathering activity without impacting analysis? even though you can start design later? No we can't. Therefore practically if we have even one activity which is starting immediately after current activity we can't delay the current activity.
On paper activity A may be delayed for activity E but practically its not possible without impacting activity C
To understand this, think a practical situation. E.g. you have an activity to gather requirement (Say Activity A) and 2 following activities Analysis (C) and Design (E) which can start after A is completed. However the relationship is such that analysis has to start immediately after requirements are gathered where as Design can be started 2 days later
In this scenario, is there any chance you can delay completion of your requirement gathering activity without impacting analysis? even though you can start design later? No we can't. Therefore practically if we have even one activity which is starting immediately after current activity we can't delay the current activity.
On paper activity A may be delayed for activity E but practically its not possible without impacting activity C
 sunku65
 Contributor
Post
Re: To calculate freefloat
Thank,
So, finally i stick with this method.
The method in the PMstudycircle is ignored.
Thanks,
Lax
So, finally i stick with this method.
The method in the PMstudycircle is ignored.
Thanks,
Lax
 saket
 Site Admin
Post
Re: To calculate freefloat
@sunku65
I could not go though the complete thread from the other website but i do agree with Namita has explained. for free float rather than formula we need to look at how the next activity is getting impacted with delay.... if no impact to anyone then only we can say this free float for given activities.
Lets try some more questions if you have , please post them as separate threads
I could not go though the complete thread from the other website but i do agree with Namita has explained. for free float rather than formula we need to look at how the next activity is getting impacted with delay.... if no impact to anyone then only we can say this free float for given activities.
Can we any way link the concept of having path level free float with the definition of free float? we can not, i have never come across anyone thinking about path level free floats , we do not have such concept.Free Float. The amount of time that a schedule activity can be delayed without delaying the early start date of any
successor or violating a schedule constraint.
Lets try some more questions if you have , please post them as separate threads
 sunku65
 Contributor
Post
Re: To calculate freefloat
Hi Saket,
According to Namita's post cleared everything. My main intention is other website's method.
Care fully compared with the starting date and finishing date of the activities instead of days.
Then i got cleared everything. Finally concluding other website method is wrong.
Thanks,
Lax
According to Namita's post cleared everything. My main intention is other website's method.
Care fully compared with the starting date and finishing date of the activities instead of days.
Then i got cleared everything. Finally concluding other website method is wrong.
Thanks,
Lax
 saket
 Site Admin
 hi2shrads
 Contributor
Post
Re: To calculate freefloat
Guys,
Interesting thread. There are certainly some questions related to FF and SS relationship in placed and asking for lead and lag etc.
Shraddha
Interesting thread. There are certainly some questions related to FF and SS relationship in placed and asking for lead and lag etc.
Shraddha
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