Two issues emerge when considering merit pay for teachers: equality and partiality.
How can you justify an "ineffective" evaluation of teacher A who had half of her students with insufficient skills, and behavior problems entering her class at the beginning of the year; while children in teacher B's classroom had only one or two students who failed to meet skills requirements and no behavior problems? This seems to be an unequal playing field.
Yes, the principal plays an important part in the school: Creating a climate of zero tolerance for bad behavior, setting an atmosphere of encouragement toward teachers and students, and showing no partiality towards the staff for evaluations.
- Grace Turner, Gary