Your most important task as a leader is to teach people how to think and ask the right questions so that the world doesn't go to hell if you take a day off.

Those who have power a) understand that the world is not always a just and fair place and accept that fact, b) understand the bases and strategies for acquiring power, and c) take actions consistent with their knowledge in a skillful way. Skill at anything requires practice, and power skills are no different.

Career success depends on people's educational credentials, their length of service (job tenure), unfortunately it is still the case on their race, gender, and similarity to those in power, and of course, on their political skills. Job performance matters, but less than most people think.

I do not think anyone who ever saw Lyndon Johnson give a speech would call him charismatic, even though he was one of the most effective presidents in U.S. history. Same with Lincoln. Charisma is only one source of power, and probably not a very important one, at that.

I would give Obama a "C." He gets an "A" for understanding this country's profound problems in education, health care, infrastructure, and economic competitiveness, and for surrounding himself with extremely skilled and knowledgeable people who know what to do. He probably gets an "F," ironically, in his ability to sell these ideas to the American public and to be angry enough, conniving enough, and frankly mean enough to get them implemented and understood.

Most organisations say they want creativity, but really they do not.

Possibly the biggest issue, however, is that performance appraisals focus managers attention on precisely the wrong thing: individual people. As W. Edwards Deming, the father of the quality movement, taught a long time ago, company performance often results more from variations in systems than from the individuals doing the work.