Longest Path with Mixture of Positive and negative float

Hi,

this is interesting, isn't zero float activities should be in the longest path (if this is also the critical path)...

but for 135 days float? check P6 options...

cheers,

the Rock

Dear Rockzy,

The option for longest path is kept " Total float = 0" , still i am getting longest path with positive float of 136 days also along with 0 days float activity, what would be any other reasons.......

regards,

Haresh Jayanth

Different calendars?

Hi Haresh

When diod you last reschedule the project?

Do you have any restraint flags on the tasks?

Are any tasks set ALAP?

Does every task have at least one outgoing link?

And as Stefano says - check your calendars particularly if you have calendars attached to resources.

Best regards

Mike Testro

check for:

project constraints

activity constraints

different calendars

that you are using the default 'longest path' filter

Are you looking at a longest path over multiple projects or a single file?

check activities that have mandatory constraints.

total float of activities in a path that leads to a mandatory constrainst are calculated relative to mandatory constraint date and not based on project finish date.

Its possible to have positive Float on the activities falling in Critical Path, when there are multiple critical paths on the program. Probably the reason stated ealier on Constraints given on activities or its Critical Successors/ Predecessors OR your activities showing 136 float have Actual Dates fed on.

Haresh,

P3’s version of longest path has nothing to do with Total Float.  Only the forward pass calculations are considered.  Once you understand how longest path is calculated, then you will see this fact.  Try a paper of mine at http://ronwinterconsulting.com/published.htm called, “Longest Path Value” for more on this interesting subject.  Good luck!