“…We consider these studies in two groups: those that analyze the relationships between observation-based measures and VAMs in a purely research context (e.g., Grossman, Loeb, Cohen, & Wyckoff, 2013;Hill, Kapitula, & Umland, 2011;Kane & Staiger, 2012;and Mihaly, McCaffrey, Staiger, & Lockwood, 2013) and those that assess these relationships as measured in the implementation of systems in practice (e.g., Kane, Taylor, Tyler, & Wooten, 2011;Sartain et al, 2011;TDOE, 2012). These studies vary in their implementation context (research versus practice), as well as in the observational measures employed (those that examine just the classroom-based aspects of observational measures and those that explore the whole measure) and in the methods used to estimate relationships between observational and test-based measures of teacher effectiveness.…”