This report describes the value-added model used as part of the state of Oklahoma's Pilot Teacher and Leader Evaluation System.

To determine how the strategy of replacing principals affected student achievement in D.C. Public Schools, the Walton Family Foundation contracted with Mathematica Policy Research. The resulting study is the first to examine the impact of such a strategy on student achievement.

In this report, we describe the value-added model used as part of the state of Oklahoma’s Teacher and Leader Effectiveness Evaluation System. We estimated measures of teacher and school effectiveness based on instruction provided in the 2013–2014 school year.