Since the early 1990s, Tennessee has used the Tennessee Value-Added Assessment System (TVAAS) as an indicator of teacher and school impact on student academic growth. In 2010, state law incorporated TVAAS into annual teacher evaluations as one of multiple measures of teacher performance. A teacher in a tested subject receives a value-added score that composes 35 percent of his or her overall evaluation, or 25 percent for teachers in non-tested subjects. These data join results from classroom observations and other student performance measures to produce a more complete view of teachers’ strengths and opportunities for improvement than any one measure can offer.
