A resource is overallocated when it is assigned too much work to complete within the resource's available time. You can resolve resource overallocations by adjusting either tasks or resources in your project.
A resource overallocation can be caused by:
- A resource assigned to work full-time on more than one task at the same time For example, if you assign a resource to two tasks of eight hours each on the same day, then the resource is overallocated because only one eight-hour task can be accomplished on that day. To view a resource's workload, on the View menu, click Resource Usage. Look at the number of tasks assigned during times of overallocation.
- Increased duration of tasks If you increase a task's duration, then the amount of work assigned to the resource also increases and may cause the resource to have too much work at one time. To view a resource's workload, on the View menu, click Resource Usage. Look at the number of hours of work assigned each day.
- Decreased unit availability for resources For example, a resource's availability is reduced from 100% units to 50% units because it is working part-time. Or, more specific nonworking time is entered on the resource calendar, such as Monday through Friday, 1:00 P.M. to 5:00 P.M. To find out if the resource has decreased unit availability, on the View menu, click Resource Sheet.
To change the working time of a resource, you need to look in the resource calendar. To this end, go to the Project menu and select Change Working Time. For the desired resource, look for decreased working time on the resource's calendar.
Unit availability: Amount of time, expressed as a percentage or a decimal number, that a resource can be scheduled for assigned work. It refers to the availability of a resource; for example, a resource may be available 50%, 100%, or 300% of full time.),