Number of Methods Overridden (NMO)

Overview

The number of redefined operations plays a role in the specialization of the class and must be maintained in a proportion that continues to justify inheritance.

Too many redefined operations implies too big a difference with the parent class and inheritance then makes less sense.

Computation

For a class, this is the count of the number of inherited operations that are redefined by the class.

Nominal range

Between 0 and 5.

Analysis

A class which inherits services must use them with a minimum of modifications. If this is not the case, the inheritance loses all meaning and becomes a source of confusion.