Knowledge@Wharton released a good article about the difference between manager and leader (typical discussion ;-) and how far you have to be an optimist guy to be a leader.

The good manager knows that not all employees work the same way. They know if they are to achieve success, they must put their employees in a position where they will be able to use their strengths. “Great managers know they don’t have 10 salespeople working for them. They know they have 10 individuals working for them …. A great manager is brilliant at spotting the unique differences that separate each person and then capitalizing on them.”

It may sound elementary, but a quick glance around the business world indicates that many companies have yet to grasp this simple concept of putting people’s strengths to use, Buckingham said. That’s because the business world — and the world at large — is obsessed with weaknesses and finding ways to fix them. Buckingham cited a recent poll that asked workers whether they felt they could achieve more success through improving on their weaknesses or building on their strengths. Fifty-nine percent picked the former.

“I do think there is a rather keen and distinct difference between managing and leading,” Buckingham said. The chief responsibility of a leader, for example, “is to rally people for a better future. If you are a leader, you better be unflinchingly, unfailingly optimistic. No matter how bleak his or her mood, nothing can undermine a leader’s belief that things can get better, and must get better. I believe you either bring this to the table or you don’t.”

Along with that optimism, great leaders can also bring big egos — and that’s not a bad thing. While some have blamed the business world’s recent string of scandals — Enron, WorldCom and others — on bloated executive egos, Buckingham disagrees. It’s not ego that ruined Ken Lay, but rather a lack of ethics. There’s a big difference, Buckingham said. And considering the responsibility facing business leaders to build a future for their companies, a big ego might be what is needed.