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Products > PSOP > Documentation
Correct Handling of Resource Calendars
Consider a project with 4 identical 24 hour long activities. Each
activity works on a 24/7 calendar. Each activity has the same resource
assigned to it. The resource can work 24 hours per day Monday through
Friday but does not work on Saturday or Sunday. There is only one of
the resource available.
There are no relationships between the activities in the project. An
initial schedule for this project would look like this:
Clearly this schedule over-allocates our resource as all 4 activities
are scheduled to work simultaneously and we only have 1 resource
available. Invoking the P3e leveler produces the following schedule:
This has spread out the work so we're never using more than one of our
resource at a time, but it has scheduled some of the activities for
times when our resource is not available. Task 3
and Task 4 are scheduled to work over the weekend when our resource is not available. Looking at the P3e resource usage profile
we see that our resource is indeed over-allocated:
Why did this happen?
P3e does not properly consider the resource calendars when leveling. As
a result it may schedule tasks to work at
times when the needed resources are not available. In addition to
scheduling resources to work on days when they are not available,
P3e may schedule resources to work at times of the day when they are
not available. For example, P3e might schedule a resource with a
standard 8 am to 5 pm schedule to work at 2:00 am.
How can PSOP Help?
PSOP handles resource calendars correctly. For the example project above, PSOP produces the following schedule:
which schedules the activities only when the resource is available and hence has no over-allocation.
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