Imagine this: You’re a gym teacher at a struggling high school. Because of the way teacher evaluations were implemented in your school, 40 percent of your rating is based on test scores in a subject you don’t teach and from students who aren’t yours. And the students do poorly. Even when your principal says you’re doing well, or exceptionally well, in classroom observations, state law says that an “ineffective” for student learning means you’re stamped with an overall “ineffective” rating.