• High-impact contributors: These people are doing work of exceptional value and impact.
• Typical contributors: These are smart and talented people who are doing solid work.
• Under-contributors: These are smart and talented people who are playing below their ability. 

The difference between the Impact players and the Contributor is the mode of thinking. It’s learnable and coachable, thus available to everyone. A leader can develop an entire team with the Impact Player Mindset.