Good principals know the union contract. Good principals weed out ineffective teachers. Of course, I can't pack the basis for that author's conclusions into this short column. You will have to read the book for that. Principals must be free.
Principals use measurable goals to establish a culture of achievement.
Master teachers bring out the best in a faculty. Rigorous and regular testing leads to continuous student achievement. Achievement is the key to discipline. Principals work actively with parents to make the home a center of learning. Effort creates ability.