The behavior of people and the culture of an organization are very different in winning streaks and losing streaks. But what both have in common is their momentum - once winners' or losers' habits and culture take hold, they tend to perpetuate themselves.

Power stems from 'rainmaking,' as law firms put it: the ability to bring resources into the company.

The importance of discretion increases with closeness to the top of a hierarchical organization.

Even the new feminist research on sex-role socialization and sex differences has sometimes had the unfortunate consequence of creating a new set of stereotypes about what women feel and how women behave. Despite the large amount of overlap between the sexes in most research, the tendency to label and polarize and thus to exaggerate differences remains in much reporting of data, which may, for example, report the mean scores of male and female populations but not the degree of overlap.

Sports is a perfect activity in which to see streaks and cycles, organizational and otherwise, in action - and to watch confidence build or erode. There are repeated episodes of performance with similar rules and clear winners or losers. I added team sports to my studies of business because there are excellent parallels to work groups in the performance of sports teams and also excellent parallels to larger, more complex businesses or organizations in the strategy, structure, and culture surrounding any particular team.

Embrace change as an opportunity to learn, to improve, to make a difference in others' lives as well as in your own. Have the courage to challenge the status quo. Remember that preparation and ambition in combination with opportunity equals success. And have fun!

It takes courage to speak up against complacency and injustice while others remain silent. But that's what leadership is.