Book I'm Reading: "High Output Management" by Andrew S. Grove

The first rule is that a measurement—any measurement—is better than none. But a genuinely effective indicator will cover the output of the work unit and not simply the activity involved.

Here I'd like to introduce the concept of leverage, which is the output generated by a specific type of work activity. An activity with high leverage will generate a high level of output; an activity with low leverage, a low level of output.