Book excerpt: What's wrong with today's teacher-evaluation systems-and how to improve them Unsound teacher evaluation practices lead to misinformed decisions regarding strategies for student learning, resulting in negative effects to students. Education measurement and evaluation expert W. James Popham critiques what is wrong with many existing teacher-evaluation systems and offers an alternate system that respects the professionalism and dignity of teachers. Popham argues that, because teaching is a very situation- specific profession, the use of any paint-by-numbers, one- size-fits-all teacher evaluation system is patently absurd. Rather, the only defensible approach to teacher evaluation is to base it on collegial judgment, that is, on the evaluative conclusions of experienced teachers who have been specifically trained and formally certified to carry out this function. This book discusses: Key strengths and weaknesses of prominent teacher-evaluation evidence How to improve a flawed teacher-evaluation program The merits of a teacher evaluation program based on "evidence-governed collegial judgment