In the Task List, double-click the Task Type cell for the task whose type you want to edit.
PPM uses five task types for scheduling tasks: Fixed Duration, Fixed Duration - Effort Driven, Fixed Units(resource allocation), Fixed Units - Effort Driven, and Fixed Work.
A task's type determines which task property (duration, resource allocation units, or planned work) remains fixed when another property changes.
Important: Any changes you make to a task in the Task List are equivalent to editing the task in the Task Details window.
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