This report updates the approach to estimating value-added models of teacher effectiveness in the District of Columbia Public Schools (DCPS) and eligible DC charter schools participating in Race to the Top during the 2012–2013 school year.

Describes how various components of Mathematica's complex study fit together and explains perspectives and principles related to 1) distinguishing implemented programs from intended ones, 2) ensuring broad coverage to explore competing theories of effective programming, 3) collecting...