The purpose of this study was to develop an instrument to examine students' behaviors in physical education classes that might have an impact on classroom management and student learning. The study was conducted in multiple phases, including instrument development, preliminary study, content validity study, and a reliability and validity study. Participants for the content validity study were 27 experts in sport pedagogy. They were sent items from the management instrument and were asked to organize them into three severity categories. Participants for the reliability and validity study were 2,309 middle and high school students from 2 states. Statistical results indicate that an instrument that produces reliable and valid scores was developed to measure students' perceptions of classroom management in physical education settings. Investigating students' views in this area will lead to a better understanding of management issues and behaviors that interfere with students' ability to learn. (Contains 3 tables and 38 references.) (Author/SLD)