### Task Types

The duration of each task is determined by resource availability and, most important, by the formula Duration = Work ÷ Resources. If you assign resources, Microsoft Project uses this formula as the basis for all its scheduling. If necessary, you can choose which piece of the scheduling equation Microsoft Project calculates for a task by setting its task type: fixed duration, fixed units, or fixed work. By default, units are fixed, which causes Microsoft Project to calculate duration.

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