When you assign a resource to work on a task, you have made an assignment. Assignments directly affect the amount of time required to complete a task and, indirectly, the total project time. When your deadlines change and you have to complete a project in less time than you had planned, you can assign more resources to a task. Essentially, you make new assignments so that it takes less time to complete the individual task. With shorter task lengths, your overall project length will shorten, too.
