MSP caculation of free slack

T

Trevor Rabey

This is on the forum at www.planningplanet.com.au

Since negative lag is always a bad idea anyway, who cares?

"Hi all,

I have the following simple example to illustrate my problem: Say we have 3
activities A, B and C where durations are respectively 5, 10 and 10 days.
Activity C are dependant of completion of both A and B. That means that
activity A has a total and free slack of 5 days, which is correct. When I
write "FS+1" from A to C it gives A a total and free slack of 4 days. Again
correct. However, when I write anything with minus it suddenly reduce the
free slack for A to zero, e.g. "FS-1" from A to C gives a total slack of 6
days for A, which is correct, but the free slack is now zero (0 days)
whereas it should be 6 days?

I don't understand this as in my mind activity A could still be delayed 6
days without delaying any other activity (C in this case).

Can anyone please explain?


Regards,

Bo"


Trevor RabeyTrevor Rabey 0407213955 61 8 92729485 PERFECT PROJECT PLANNING
www.perfectproject.com.au
 
G

Gérard Ducouret

Trevor,

I'm afraid there is no explanation. That's obviously a bug in the scheduling
algorithm.

Gérard Ducouret
 
M

myuser

It looks like a bug in MS project 2003. But I have tried the same in MS
project 2007. It works fine.
Try in MS Project 2007.

Hope it helps

regards
myuser
 

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