Changing a task's duration

[Jennifer]

I am adapting a Project Professional plan that someone else created. Tasks,
durations and start/finish times were already entered, but resources were
not. I have now specified resources and working times. When I try to add
resource names to a task, however, it changes the start and/or finish date.
Even when I open the task information and delete the duration, adding a
resource alters the start/finish date. I have increased the resource's
working hours to 1000% just to see if that is what is causing the task dates
to change, but it doesn't help. Does anyone know what is going on, or what I
am doing wrong (or not doing)? Thx

 

[JulieD]

Hi Jennifer

when assigning resources one of the things that Project does is reschedule
the work when the resource is available to do it. Therefore a task that
might be scheduled on March 1 may be shifted to March 8 if the resource is
on holidays for the week. To see resource holidays, double click on the
resource in the resource sheet, choose the working time tab and look for
holidays.

other factors which could come into play are - conflicts between the
resource's working time calendar and the project's calendar - ie your
project calendar is a 24 hr one, but all resources have the standard
calendar assigned (check the base calendar column in the resource sheet).

these are just two ideas off the top of my head - there's probably other
possible options - oh, another option is that automatic levelling has been
turned on - tools / level resources or resource levelling option (depending
on your version) ... ensure that it is set to manual not automatic.

hope this helps
Cheers
JulieD