Understanding Duration, Work and Units

Remember,

Duration x Units = Work

Fixed Units suggests that are the amount of capacity that a resource can devote to a task. An example of this is that you suggest to Microsoft Project that a resource can only work 50% of the time on a specific task. Microsoft Project will then automatically calculate the duration of the task with the resource only working 50% of the time.

Fixed Duration suggested that the task the task must be completed within a given duration. As you assign a single or multiple resources to the task, Microsoft Project will automatically calculate the appropriate resource allocation percentage to ensure the task is completed within the given duration.

Fixed Work suggests that a task has a specific numbers of hours work associated with it. In this scenario, we know that the task is going to take ten hours to complete. We have the ability to schedule the tasks overall duration for five days with fixed work of ten hours. Assuming a single resource is responsible for completing the task, Microsoft Project will schedule the resource to work two hours a day for the five day duration.