Summary Float
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Thanks a lot Vladimir,
Now it is clear to me.
Regards.
Marcio Eduardo.
Marcio,
I suggest to consider one very simple example.
Project Sample consists of 4 activities and finish milestone.
Activities 1, 2 and 4 have 10 days duration, duration of activity 3 is 1 day, activity 5 has zero duration (milestone).
Activity 2 follows activity 1, activity 4 follows activity 3. Activities 2 and 4 precede activity 5. All dependencies are Finish-to-Start.
Project resources include one unit of resource A and one unit of resource B.
Resource A is assigned to activities 1 and 3, resource B is assigned to activities 2 and 4.
Project schedule calculated by P3e using default leveling algorithm has 30 days duration – project starts with activity 1, then 2, then 4. Activity 3 is planned after activity 1 finish.
The same schedule is calculated by MS Project. These packages calculate the same resource-constrained schedules but different activity floats. Both results are wrong.
P3e shows that activity 4 has 10 days float. Can you explain this? It is interesting to understand the meaning of 10 days total float of the last activity in the schedule.
By the way the optimal schedule for this project lasts 21 day and starts with activity 3.
Try this example or any other project with limited resources. You will notice that total floats calculated in resource-constrained schedules are not feasible. Most planners do not level project resources and just do not notice serious problems with resource constrained scheduling that exist in many packages.
Happy New Year!
Vladimir
Hi Vladimir,
Sorry, didnt know that. Coul u please explain me better?
Best Regards.
I hope that you know that P3e calculates wrong floats when resources are limited?
-100 negative float is bigger than -1 negative float.
Regards.
Marcio
Biggest negative float is the one closer to Zero
DO you agree ??
-100 and -1 Which one is bigger??
HEHE
Alex
I siad "biggest total float " ... but i was trying to say "biggest negative float"
Regards.
Dear all
A summary float under a group of activities is the "Least (minimun)" float within that group of activity
Why?? SIMPLE
because you want to know how critical is that group fo activity are when they are summarised.
Of if just one activity within that group of activity have a negative float the summary bar will also have a negative float
HTH
ALex
Hi Dave;
Thanks for your explanation. Is it in the P3e manual? Could u tell me the page so i can read?
Regards.
Marcio Eduardo
Marcio,
I found the answer in the book. The calculation is, depending on your settings (early or late), the float between the earliest early start and the latest early start for the activites under that summary level. I find it to be a confusing number for a project manager and trying to explain it didnt help. What would be nice is if I could show the activity float without the summary.
This came about when a client p.m. asked why there was float in an area that the critical path "passed through". He ended up righting it off to another quirk of P3.
Not usefull.
Thanks,
Dave
Dave;
As i know, in P3e, total float for summary bars is equal to the biggest total float in the activities that are under summary bar.
But im not totaly sure.
Regards.