This study investigated K-12 teachers' opinions about the use of student surveys as a component of a teacher evaluation system. Surveys were administered to teachers at the beginning of the school year and again in the spring. Analyses of teachers' responses on the fall survey indicated tentative support for the inclusion of student feedback in teacher performance ratings, as well as some uncertainty. Teachers of lower elementary grades were more skeptical than teachers of other grade levels regarding the use of student survey data and were more doubtful about their students' ability to distinguish between effective and ineffective teaching behaviors. Comparisons of fall and spring responses showed a consistent decrease in teachers' support for the use of student surveys regardless of grade level taught. In addition, teachers were more skeptical than principals with respect to both the validity of student survey data and the usefulness of student feedback for improving teaching performance.