For many teachers, the classroom observation has been the only opportunity to receive direct feedback from another school professional. As such, it is an indispensable part of every teacher evaluation system. Yet it also requires a major time commitment from teachers, principals, and peer observers. To justify the investment of time and resources,…

States and districts have launched unprecedented efforts in recent years to build new feedback and evaluation systems that support teacher growth and development. These systems depend on trustworthy information about teaching effectiveness--information that recognizes the complexity of teaching and is trusted by both teachers and administrators.…