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.

The Martha Stewart trial makes clear how far women have risen in the business world. America can be proud of our equal-opportunity prosecution and conviction.

The very lack of opportunity the group faces creates a self-defeating cycle and puts pressure on members to limit their aspirations.

The positive outlook that optimists project does not come from ignoring or denying problems. Optimists simply assume that problems are temporary and can be solved, so optimists naturally want more information about problems because then they can get to work and do something. Pessimists are more likely to believe that there is nothing they can do anyway, so what's the point of even thinking about it?

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.

Nations need to understand their own strengths and weaknesses, and India's tradition of dissent and democratic debate is a positive aspect.

Peter Drucker being one of the most important influences because he has helped to think differently about organizational leadership and management. Frankly, I learn something of value from everyone I meet. My Harvard colleagues. My students. The executives I work with. For an eager student, which is what I am, there is so much to be learned from everyday experiences. I'm a sponge. Always will be.