The teachers unions say that job evaluations cannot be fair because too many other factors affect the achievement level of their students. If a teacher gets stuck with a class of poor students, they would be penalized. That is a red herring.
Fair evaluations would measure PROGRESS over the course of the year the teacher has an impact.
A teacher ending the year with a class of students with average test scores, when they started the year with low test scores should get the highest salaries.
