Direct. To the extent possible, try to select a measure that most accurately represents (or actually is) the real target. The closer the measure approximates the real target, the more useful it will...

Direct. To the extent possible, try to select a measure that most accurately represents (or actually is) the real target. The closer the measure approximates the real target, the more useful it will be. Indirect measures have their place. But the more direct your measure, the more accurately you will be able to assess a situation.