Teacher evaluation is a process used to measure teacher effectiveness based on students learning and success. Evaluations of teachers over the years have changed. In earlier years, teacher evaluations were based on personal characteristics of the teacher, however, starting in the early 1950s until the 1980s, teacher evaluations took a shift and started to focus on teachers' teaching, observed through students' outcomes. After the 1980s, teacher evaluations were measured based on increased professional development, accountability, and school improvement. While the MET approach uses five measures to evaluate teacher effectiveness, the Danielson Framework for Teaching model evaluates teachers using four domains: planning and preparation, classroom environment, instruction, and professional responsibilities. In this framework of evaluation, teachers are evaluated through a rubric that contains these four domains. They can either be ranked or measured as unsatisfactory, basic, proficient, or distinguished. In this rubric, teachers are being evaluated through critical attributes and examples when being observed. Teacher responses to this evaluation system have been positive because the evaluation system presented clear and specific standards. Administrators generally perceive the Danielson Framework as positive because of the rigorous and specific statement of standards. One concern that administrators have about using the Danielson Framework as the sole evaluation model is that teachers may alter their behavior only around observable classroom behaviors, limiting how representative the evaluations truly are. Many schools use Danielson's framework for teaching to assess teachers. The CLASS approach, by Robert Pianta, evaluates teachers based on their interaction with students. To do this, the CLASS model evaluates teachers' interactions using three domains: emotional support, classroom organization, and instructional support. This approach is much more flexible, as the domains used within the approach vary based on students' grade levels. On the other hand, the
VAM approach uses students' test score gains to reflect teachers' effectiveness. Unlike the other approaches that evaluate particular characteristics or style of teaching for teacher evaluations, VAM does not directly evaluate the teacher. Although many of the approaches for teacher evaluations are debated, VAM is said to be inconsistent in its approach due to variation in classes, years, or test since its effectiveness measures are not based on teachers. However, it said that VAM measures are retroactively effective due to teacher practices that influence learning of students. that have been developed after several years of research and feedback. ==Course evaluation==