Abstract: A user interface is presented that allows a user to group tasks. After the tasks are grouped, reassigning one of the assignments from a first resource to a second resource causes one or more subsequent assignments to also be reassigned. In some example embodiments, the reassignment changes the duration of the reassigned tasks. For example, a first resource may be unavailable on Tuesday and assigned tasks on Monday and Wednesday. Reassigning the two tasks to a different resource that is available on Tuesday may cause the tasks to be assigned on Monday and Tuesday, thus taking two calendar days to complete instead of three. Deleting one of the assignments causes one or more subsequent assignments to also be deleted.