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?

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 more closed the circle, the more difficult it is for 'outsiders' to break in. Their very difficulty in entering may be taken as a sign of incompetence, a sign that the insiders were right to close their ranks.

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.

Leaders is the new organisation do not lack motivational tools, but the tools are different from those of traditional corporate bureaucrats. The new rewards are based not on status but on contribution, and they consist not of regular promotion and automatic pay rises, but of excitement about the mission and a share of the glory of success.

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.