From Dave's original post, it sounds like he is trying to "hold" dates which are prior to the data date.
This would not be done by applying a constraint, but by applying actual dates -this is done by ticking the boxes to the left of the started & finished dates
Dave: P6 (correctly) will not allow any activities to have start or finish dates before the data date, unless you have told P6 that the activity has been started or completed, respectively. You do this by ticking the little boxes next to the "start" and "finish" dates.
I think you're proably use to MS Project, which allows for such abhorrences. P6 doesn't.
Cheers,
G
Member for
21 years 8 months
Member for21 years8 months
Submitted by Rafael Davila on Sun, 2012-02-12 12:22
There is no need to fool CPM math to show criticality under date constraints. If the date constraint break logic then logic dates shall prevail. This is how Spider applies date constraints, shows criticality without breaking logic. A very simple concept, well kind of after you see the dog balls you know is a male dog. It is about correct mathematical modeling.
In Operations Research, a science of British origin similar to Newton Calculus, if you have a Linear Programming problem you have multiple constraints that must be satisfied, the correct solution shall stisfy all constraints. In scheduling you migh have date constraints but you also got logic, and logic is the mother of all constraints. Good scheduling consider all constraints.
Member for
16 years 7 monthsFrom Dave's original post, it
From Dave's original post, it sounds like he is trying to "hold" dates which are prior to the data date.
This would not be done by applying a constraint, but by applying actual dates -this is done by ticking the boxes to the left of the started & finished dates
Dave: P6 (correctly) will not allow any activities to have start or finish dates before the data date, unless you have told P6 that the activity has been started or completed, respectively. You do this by ticking the little boxes next to the "start" and "finish" dates.
I think you're proably use to MS Project, which allows for such abhorrences. P6 doesn't.
Cheers,
G
Member for
21 years 8 monthsMike,I agree with you.There
Mike,
I agree with you.
There is no need to fool CPM math to show criticality under date constraints. If the date constraint break logic then logic dates shall prevail. This is how Spider applies date constraints, shows criticality without breaking logic. A very simple concept, well kind of after you see the dog balls you know is a male dog. It is about correct mathematical modeling.
In Operations Research, a science of British origin similar to Newton Calculus, if you have a Linear Programming problem you have multiple constraints that must be satisfied, the correct solution shall stisfy all constraints. In scheduling you migh have date constraints but you also got logic, and logic is the mother of all constraints. Good scheduling consider all constraints.
Best regards,
Rafael
Member for
19 years 10 monthsHi Dave Why do you want to
Hi Dave
Why do you want to "Hold" dates in your schedule?
It affects the critical path and causes negative float - all bad planning.
Best regards
Mike Testro
Member for
13 years 9 monthsWhat is the activity type of
What is the activity type of these activities you want to hold constraint? I suspect they are LOE activities linled to completed tasks.
Member for
16 years 7 monthsDave, Have you checked the
Dave,
Have you checked the little boxes to the left of the "Started" and "finished" dates on your status tab?