Float Values (I’m new to Openplan)

It’s been a while, but I think this is right:

The ’finish no later than’ constraint constrains the dates of the activity, not the float. In the absence of a project completion target date, Open Plan assumes it is equal to the Early finish of the final activity for calulating total float, hence you never get a positive project float.
(NB: I think the final activities ’free float’ will be the number you are looking for in this situation, but that’s a bit of a fudge)

You can assign a target finish date to the project from the ’project properties’ menu

Or you can use a ’target finish’ type of constraint instead of a ’finish no later than’ on your final activity. (NB: but not the ’fixed target’ type. This type basically says "this activity will finish on this date, regardless of logic or progress")

HTH

G

Dear Will,

The simplist and best way to understand the CPM is to use the Finish-to-start relationships.

A simple check of the internet will provide you with plenty of information; I found this one quickly.

http://courses.washington.edu/outfox/Rosemary.pdf

From the basics you can gradually increase the difficulty of the relationship and the use of leads and lags and build up a program to suite your project.

Hope it will help.

Best,

Samer

Hi Will,
I’m guessing here but what I think you are seeing is the worst Case Float. If the Critical milestone is the last activity in the schedule then the float between this activity and the end of the schedule will be zero as the end date of the project is the same as the end date of this activity.
If you set a Project end date beyond the critical milestone then you will see a positive float value, ie contingency.