The estimate to complete (ETC) value for a task is obtained through dialog and discussion with the resources involved. Based on their understanding of the effort that is involved, resources can provide estimates for completing the task.
To assist in the entry of ETC values, when you initially assign a resource to a task, the product makes the following assumptions about the assignee:
The product then automatically populates the ETC field for the task by default using the following calculation:
ETC = (The number of working days that the resource is assigned to work on the task) * (The number of hours each day that the resource is available for work on that project, known as allocation)
To calculate the default ETC, the product considers the following resource factors:
Unless you specify a different number in the resource profile, the product assumes that eight hours of work time are available daily. The product adjusts this availability by the project allocation to determine the number of hours that are used for the default calculation.
Note: The default calculation is intended merely as a shortcut method for entering estimates, not as a substitute for obtaining valid estimates through dialog and discussion with the assigned resources. We recommend that you start with the default ETC and then adjust it to match the valid ETCs obtained through discussions, as necessary. You can edit either the whole ETC or the time-phased ETC.
Examples of Default Calculation
Example 1
Aaron Connors and Patty Chen each have eight hours daily availability. You allocate Aaron 100 percent to a project and assign him to a task for five days. You allocate Patty 50 percent to the same project. You also and assign her to the same task for five days. The product calculates the default ETC for Aaron for this task as 40 hours (8 hours daily * 5 days * 100 percent allocation). The product calculates the default ETC for Patty as 20 hours (8 hours daily * 5 days * 50 percent allocation).
Example 2
You schedule a task between 6/30/14 and 7/30/14. The task contains 22 working days and has one resource with 100 percent project allocation. The resource is assigned to the task for eight hours a day for all 22 days. The product calculates the default ETC for the task as 176 hours (22 days * 8 hours each day * 100 percent allocation). You assign two extra resources to the task, each with a total daily availability of eight hours. One resource for 50 percent of the available time and the other resource for 100 percent. The combined ETC for the task calculates to 440 hours (the original 176 + the new resource for 176 + the second new resource at 50 percent for 88).
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