It's easy to think that the best teams are collections of highly accomplished or talented individuals, working under a skilled leader. But that's no guarantee of success. Psychologist Anita Woolley says the best teams are far more than the sum of their parts, and they share certain basic...

After we make a decision, we often tell ourselves a story about why our choice was the right one to make. It's a mental process that psychologist Elliot Aronson calls self-justification. These rationalizations can sometimes lead us to excuse bad behavior or talk ourselves out of a poor choice....