A Florida law basing teacher pay partly on students' state test performance goes into effect this year, but how it will affect specialty teachers in subjects such as debate and music is unclear. There aren't statewide criteria for measuring the teachers' performance, and districts will be tasked with creating criteria. However, it can be difficult to single out the impact of a specific educator. "The art teacher, the drama teacher, the music teacher give kids some purpose to come to school ... We all work together. How do you evaluate one over the other?" said Karen Whetsell, a high-school principal.