As school districts create systems to identify, monitor, and assess teacher effectiveness, they consider a variety of sources, including observations of teaching practices and analysis of student assessments. A new voice--student perceptions--has emerged as a valuable source of information. In many districts, leaders are collecting data from a range of stakeholders that includes students, parents, and educators to gather their perceptions of school culture, classroom conditions, and teaching effectiveness. A framework called the Seven C's is delivering data on student engagement, opening the door to improved professional learning. A key concept underlying the Seven C's framework is the instructional tripod of content knowledge, pedagogical skill, and relationships. This tripod emphasizes the range of factors at work in the classroom, and the Seven C's further delineate the classroom conditions, teacher actions, and implications for students.