Problem with Multiple Calendars and Float

I can only guess that it's because of the difference in calendars;

and the links as FS for all;

if you got the same calendar for all,

then your total float will be zero

Check if there are no Finish No Later han constrints.

There are no constraints on any of the activities except for the first one (A) which has a "Start on or After" primary constraint.

That is correct, if I had the same calendar for all my activities, the total float of each of my critical path activities would be zero. I think this may be a bug.

Rob,

In P6, the default number of hours per day is 8 hours = 1 day, the moment you change the working hours then the calculations will change.

Regards,

Daniel

It seems to be calculating the late finish of Activity A using Activity B's calendar, for some reason.

Can you try a couple of things for me?

(1) Please confirm relationship from A to B is FS with zero lag

(2) Please confirm what settings you have in schedule options for "Compute Total FLoat As" and "Calendar for scheduling relationship lag"

(3) What happens to total float if you change the settings in (2)?

(4) What happense to total float if you make activity B a start milestone?

(5) What happens if you make it a task?

(6) What happens if you dissolve activity B?

(7) What happens if you give Activity B (as a finish milestone) the continuous calendar?

It might be an issue with the lag calendars, unfortunately P6 is limited to some global control of lag calendars instead of an independent calendar. Sometimes you need it to be equal to successor, sometimes you need it to be equal to predecessor and sometimes different to successor or predecessor but not a 24/7 calendar.

• Predecessor Activity Calendar - Choose this option to calculate lag based on the predecessor activity's calendar.
• Successor Activity Calendar - Choose this option to calculate lag based on the successor activity's calendar.
• 24 hour calendar - Choose this option to use a calendar that specifies work time 7 days/week and 24 hours/day.
• Project Default Calendar - Choose this option to use the calendar that is designated as the default for new activities.
• The default calendar for new activities is specified on the Administration > Calendars page or in the Project Management module.

Suggest you try changing the options and see if the computed values of float varies.
Also try changing the milestone type from finish to start milestone.