Introverts .. may have strong social skills and enjoy parties and business meetings, but after a while wish they were home in their pajamas.

In the first study, Grant and his colleagues analyzed data from one of the five biggest pizza chains in the United States. They discovered that the weekly profits of the stores managed by extroverts were 16 percent higher than the profits of those led by introverts—but only when the employees were passive types who tended to do their job without exercising initiative. Introverted leaders had the exact opposite results. When they worked with employees who actively tried to improve work procedures, their stores outperformed those led by extroverts by more than 14 percent.

Cross the street to avoid making aimless chitchat with random acquaintances.

Studies have shown that performance gets worse as group size increases ... If you have talented and motivated people, they should be encouraged to work alone when creativity or efficiency is the highest priority.

A widely held, but rarely articulated, belief in our society is that the ideal self is bold, alpha, gregarious. Introversion is viewed somewhere between disappointment and pathology.

Figure out what you are meant to contribute to the world and make sure you contribute it. If this requires public speaking or networking or other activities that make you uncomfortable, do them anyway. But accept that they're difficult, get the training you need to make them easier, and reward yourself when you're done.

Ask your child for information in a gentle, nonjudgmental way, with specific, clear questions. Instead of “How was your day?” try “What did you do in math class today?” Instead of “Do you like your teacher?” ask “What do you like about your teacher?” Or “What do you not like so much?” Let her take her time to answer. Try to avoid asking, in the overly bright voice of parents everywhere, “Did you have fun in school today?!” She’ll sense how important it is that the answer be yes.