“…Previous studies have shown that improved student achievement is linked to more rigorous student assignments, including asking students to engage in higher level thinking, apply core content, and provide extended explanations of information (Newmann, Bryk, & Nagaoka, 2001;Newmann, Lopez, & Bryk, 1998). Studies have found specific positive relationships between the rigor of instruction in mathematics classrooms and the quality of student work and subsequent test scores (Mitchell et al, 2005;Shkolnik et al, 2007). Additionally, positive relationships have been found between rigorous instructional strategies, such as engagement in higher order thinking, and the teachers' value-added scores (MET Project, 2010, 2012.…”