“…A classroom observation conducted by a supervisor or school administrator is the most widely used measure of teacher effectiveness and may be “used to measure observable classroom processes, including specific teacher practices, holistic aspects of instruction, and interactions between teachers and students” (Goe et al, 2008, p. 16). Given the problems associated with application of value-added measures to special education teachers (Ballou & Springer, 2015; Darling-Hammond, 2015; Harris & Herrington, 2015; Gansle et al, 2015; Goldhaber, 2015; Jones, Buzick, & Turkan, 2013), it can be anticipated that increased emphasis will be placed on observation systems as a data source for teacher evaluation (Jones & Brownell, 2014). A range of teacher observation systems are available and effective in discriminating between effective teachers and those who are less effective (Klinger, Brownell, & Bateman, 2011).…”