Simplified (not an essay) set of reasons:1. Herding cats is hard, i.e. how to point them in the same direction (as the company strategy - a.k.a how do you communicate "this is what the company thinks is important")2. How do you spot bad performers (those who are busy but never seem to ship / deliver)3. How do you provide timely opportunities to learn / grow / improve
Simplified (not an essay) set of reasons:1. Herding cats is hard, i.e. how to point them in the same direction (as the company strategy - a.k.a how do you communicate "this is what the company thinks is important")2. How do you spot bad performers (those who are busy but never seem to ship / deliver)3. How do you provide timely opportunities to learn / grow / improve