What sets the great boss apart from the average boss? The literature is rife with provocative writing about the qualities of managers and leaders and whether the two differ, but little has been said about what happens in the thousands of daily interactions and decisions that allows managers to get the best out of their people and win their devotion. What do great managers actually do?

In my research, beginning with a survey of 80,000 managers conducted by the Gallup Organization and continuing during the past 2 years with in-depth studies of a few top performers, I’ve found that while there are as many styles of management as there are managers, there is one quality that sets truly great managers apart from the rest: They discover what is unique about each person and then capitalize on it. Average managers play checkers, while great managers play chess. The difference? In checkers, all the pieces are uniform and move in the same way; they are interchangeable. You need to plan and coordinate their movements, certainly, but they all move at the same pace, on parallel paths. In chess, each type of piece moves in a different way, and you can’t play if you don’t know how each piece moves. More important, you won’t win if you don’t think carefully about how you move the pieces. Great managers know and value the unique abilities and even the eccentricities of their employees, and they learn how best to integrate them into a coordinated plan of attack.

This is the exact opposite of what great leaders do. Great leaders discover what is universal and capitalize on it. Their job is to rally people toward a better future. Leaders can succeed in this only when they can cut through differences of race, sex, age, nationality, and personality and, using stories and celebrating heroes, tap into those very few needs we all share. The job of a manager, meanwhile, is to turn one person’s particular talent into performance. Managers will succeed only when they can identify and deploy the differences among people, challenging each employee to excel in his or her own way. This doesn’t mean a leader can’t be a manager or vice versa. But to excel at one or both, you must be aware of the very different skills each role requires.

All that said, the reason great managers focus on uniqueness isn’t just because it makes good business sense.

Make the Most of Strengths

It takes time and effort to gain a full appreciation of an employee’s strengths and weaknesses. The great manager spends a good deal of time outside the office walking around, watching each person’s reactions to events, listening, and taking mental notes about what each individual is drawn to and what each person struggles with. There’s no substitute for this kind of observation, but you can obtain a lot of information about a person by asking a few simple, open-ended questions and listening carefully to the answers. Two queries in particular have proven most revealing when it comes to identifying strengths and weaknesses, and I recommend asking them of all new hires — and revisiting the questions periodically.

To identify a person’s strengths, first ask, “What was the best day at work you’ve had in the past three months?” Find out what the person was doing and why they enjoyed it so much. Remember: A strength is not merely something you are good at. In fact, it might be something you aren’t good at yet. It might be just a predilection, something you find so intrinsically satisfying that you look forward to doing it again and again and getting better at it over time. This question will prompt your employee to start thinking about his interests and abilities from this perspective.

To identify a person’s weaknesses, just invert the question: “What was the worst day you’ve had at work in the past three months?” And then probe for details about what he was doing and why it grated on him so much. As with a strength, a weakness is not merely something you are bad at (in fact, you might be quite competent at it). It is something that drains you of energy, an activity that you never look forward to doing and that when you are doing it, all you can think about is stopping.

Although you’re keeping an eye out for both the strengths and weaknesses of your employees, your focus should be on their strengths. Conventional wisdom holds that self-awareness is a good thing and that it’s the job of the manager to identify weaknesses and create a plan for overcoming them. But research by Albert Bandura, the father of social learning theory, has shown that self-assurance (labeled “self-efficacy” by cognitive psychologists), not self-awareness, is the strongest predictor of a person’s ability to set high goals, to persist in the face of obstacles, to bounce back when reversals occur, and, ultimately, to achieve the goals they set. By contrast, self-awareness has not been shown to be a predictor of any of these outcomes, and in some cases, it appears to retard them.

The focus-on-strengths approach might create in the employee a modicum of overconfidence, but great managers mitigate this by emphasizing the size and the difficulty of the employee’s goals. They know that their primary objective is to create in each employee a specific state of mind: one that includes a realistic assessment of the difficulty of the obstacle ahead but an unrealistically optimistic belief in their ability to overcome it.

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