And what’s that metric? The percentage of key seats on the bus filled with the right people for those seats. Stop and think: What percentage of your key seats do you have filled with the right people? If your answer is less than 90 percent, you’ve just identified your number one priority. To build a truly great company, you’ll need to strive for having 90 percent of your key seats filled with the right people.

There’s no algorithm to apply, no flow chart to follow, no equation to run to get a perfect hit rate on the decision to develop or replace. The best executives care deeply about their people, and that’s why they often wait too long. But they also improve their judgment over time.

Which brings us to a crucial question: How do you know when you’ve crossed the demarcation line, when it’s time to make the shift from “develop” to “replace” for a key seat? I’ve come to believe the best approach is to ask considered questions and let those questions guide you to an answer. I’ve distilled years of reflection down to seven questions that I offer here to stimulate your thinking when you face the “develop or replace” conundrum. To be clear, these aren’t a prescription; you might come up with only one concern and decide to replace, or you might come up with six concerns and decide to develop.

• Are you beginning to lose other people by keeping this person in the seat?

The best people want to work with the best people, and if they sense chronic tolerance for mediocre performance in key seats, they might begin to vote with their feet. Worse, if you tolerate high-performing people who behave contrary to your stated core values, the true believers will begin to lose heart and become cynical, and some will leave. There’s no better way to destroy a great culture than to retain people in key seats who fail to perform or run roughshod over the company’s core values. roughshod over the company’s core values.

• Do you have a values problem, a will problem, or a skills problem?

If someone in a key seat behaves consistently or flagrantly contrary to the core values of the enterprise, the best leaders replace them. If someone passionately embraces the core values of the enterprise and also has the indomitable will to do whatever it takes to master his or her seat, you can be more patient before reaching a decision to replace them in that seat. The hardest call comes with the question of will. Does the person lack (or has the person lost) the will to develop to meet the demands of the seat? If not, can you ignite their will?...

• What’s the person’s relationship to the window and the mirror?

The right people in key seats display window-and-mirror maturity. When things go well, the right people point out the window, giving credit to factors other than themselves; they shine a light on other people who contributed to the success and take little credit themselves. And when things go awry, they don’t blame circumstances or other people for setbacks and failures; they point in the mirror and say, “I am responsible.” People who look in the mirror—who always ask, “What could I have done better? What did I miss?”—will grow. People who always point out the window to explain away problems or affix blame elsewhere will be stunted in their growth.

• Does the person see work as a job or a responsibility?

The right people in key seats understand that they don’t have “jobs”; they have responsibilities. They grasp the difference between their task list and their true responsibilities. A great doctor doesn’t merely have the “job” of performing procedures but embraces responsibility for the health of the patient… Every person in a key seat has a broader responsibility than a task list, and the right people never hide behind “I got the tasks done” as an excuse for failing to deliver on the broader responsibility.

• Has your confidence in the person gone up or down in the past year?

Just as a company’s stock price rises or falls as investors gain or lose confidence in the company’s growth and performance, confidence in a person also rises or falls based on his or her growth and performance. The critical variable is the trajectory of that confidence over time. When someone says, “Got it!” do you increasingly set your worries aside or do you increasingly feel the need to follow up?”

• Do you have a bus problem or a seat problem?

Sometimes you might have a right person on the bus but in the wrong seat. You might have put the person in a seat misaligned with his or her capabilities or temperament. Or perhaps—and this happens frequently in high-growth companies—the demands of a seat might have grown to outstrip the capabilities of the person in that seat.

• How would you feel if the person quit?

If secretly relieved, then you might have already concluded that he or she is a wrong person on the bus. If genuinely distraught, then you might well believe that he or she is still a right person on the bus.

As a leader, you are the embodiment of that company. What that means is this: Your values—your sense of integrity and decency and honesty, the way you comport yourself in the world—are a stand-in for the values of the company. You can be the head of a seven-person organization or a quarter-million- person organization, and the same truth holds: what people think of you is what they’ll think of your company.

• What is the essence of what the company stands for?

• How is it really different from its competitors?

• What do the people who are most successful share in common?

• What are the common traits among those who have failed?

• Who are the five most respected people in the organization and why?

• What are the characteristics of the organization’s failures or missed opportunities?

What makes a failure qualify as intelligent? Here are four key attributes: it takes place in new territory; the context presents a credible opportunity to advance toward a desired goal (whether that be scientific discovery or a new friendship); it is informed by available knowledge (one might say “hypothesis driven”); and finally the failure is as small as it can be to still provide valuable insights. Size is a judgment call, and context matters. What a large company can afford to risk on a pilot project may be greater than what you can afford to risk on a new endeavor in your personal life. The point is to use time and resources wisely. A bonus attribute is that the failure’s lessons are learned and used to guide next steps.