It is common knowledge that teacher quality is a key in-school factor affecting student achievement. While the quality of teaching clearly matters for how much students learn, this quality is challenging to measure. Evaluating teacher quality based on the level of their students' end-of-year test scores has been one method of assessing…

Teacher training programs are increasingly being held under the microscope. Perhaps the most notable of recent calls to reform was the 2009 declaration by U.S. Education Secretary Arne Duncan that "by almost any standard, many if not most of the nation's 1,450 schools, colleges, and departments of education are doing a mediocre job of…

Better teacher evaluation should lead to better instruction and improved outcomes for students, but more accurate classification of teachers requires better information than is now available. Because existing measures of performance are incomplete and imperfect, measured performance does not always reflect true performance. Teachers who are truly…

There are good reasons for re-thinking teacher evaluation. Evaluation systems in most school districts appear to be far from rigorous. A recent study showed that more than 99 percent of teachers in a number of districts were rated "satisfactory," which does not comport with empirical evidence that teachers differ substantially from each…