When you assign a resource to a task, the estimate to complete (ETC) for the task is automatically calculated. Allocation (percent) and availability (Hours) for a resource assignment determines the ETC for the task based on the assignment start and finish dates. The calculation is based on the following formula:
ETC = the number of working days the resource is assigned to work on the task * the number of hours each day that the resource is available for work
The calendar and daily availability for a resource is used to determine the total availability for the resource. Unless you specify a different number in the resource profile, eight hours of work time are available daily, by default, for each resource is assumed.
Example 1
You allocate Aaron Connors 100 percent to a project and assign him to a task for 5 days with 8 hours availability. The ETC for Aaron is 40 hours. You allocate Patty Chen 50 percent to a project and assign her to the same task for 5 days. The ETC for Patty is 20 hours.
Example 2
You schedule a task between 6/30/11 and 7/30/11. The task contains 22 working days and has one resource assigned to it for 8 hours a day for all 22 days. The ETC for the task is calculated at 176 hours (22 days * 8 hours each day). You assign two resources to the task, each with a total daily availability of 8 hours. One resource for 50 percent of the available time and the other resource for 100 percent. The combined ETC calculates to 264.
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