It began with a trip to the cinema to see Cameron Diaz in her new comedy, "Bad Teacher." It was a bad choice. Not a great flick, but as a parody of bad employees, in terms of things that can get one fired--drugs, alcohol , cheating, foul language, inappropriate sexual behavior--Diaz slams pedal to the metal. She nips out of airline booze bottles…

The importance of effective principals to school reform is well-documented. But what makes a school principal an effective change agent, and how can a school board and district administrators assist in pushing their top site leaders to excellence? Many district and board leaders say it's all about vision, building trust with staff, and developing…