Why you should know about the resource allocation view when leveling?
The Resource Allocation view (view tab > more views > resource allocation view) is perhaps the best view to use when you have MS Project do the leveling for you. This combination view combines the resource usage view and the Leveling Gantt view. To understand and appreciate its value, have a look at the images below. The first shows an over allocation and in the second you will see the delay of each task as a consequence of the leveling action.
The olive-green bar represents the pre-leveled task and the olive-green line is the leveling delay. The field leveling delay keeps track of the number of days the task was delayed as a consequence of the leveling action. These are called ‘edays’, short for elapsed days.