effectiveness

The summary of a lesson, given by the class, is a test of the effectiveness of instruction.

Their help is essential to ensure the effectiveness of the exorciser's task.

But this result only added to the effectiveness of the scene, though it was painful.

The face is that of an aloof and sunny spirit, full of energy and effectiveness.

But force of habit had utterly dulled its effectiveness as a weapon.

Because of their limitations, however, their effectiveness can be furthered by interpretation.

This is an argument often cited, and with some effectiveness during the war.

Again the effectiveness of the schools work is shown by its results.

This was just what Joe wanted, for he knew it added to the effectiveness of the act.

At any rate, their effectiveness was not equal to what might have been expected.