Project 2007 binds calendar through different approaches

1. Project scale: by default MS Project schedules tasks according to Project default calendar
2. Resource scale: if a specific resource working time is different than the project one then a special calendar can be created for him
3. Task scale: sometimes calendars are applied to Tasks, Ex. night backup, which means it runs in its own calendar

Now which one dominate the others??

let say simply it is like the following

Rule 1: Task Calendar will overwrite the Resource Calendar

Rule 2: Resource Calendar will overwrite Project Calendar

Best Regards

Bilal Okour