External Class Description (ECD)
ECD measures the complexity of the external class interface;
A too high ECD may show that the class is too complex to be easy understandable;
ECD alone cannot measure class understandability.
This histogram is similar to the CC one. Like explained before ECD alone donít give a good representation of understandability because is not related to the total class complexity. Some class that have an too high ECD must be inspected because a low understandability can be due to a too complex class interface.