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This paper shares the results of an experimental study examining the relationship between changes in student understandings in mathematics concepts as evidence by an analysis of student artifacts and measures of teacher effectiveness in the implementation of MDC in ninth-grade Algebra I classes in Kentucky. This study included the development of rubrics to address two positive dimensions of learning, content accuracy and quality of mathematical explanations, as well as a third rubric examining evidence of common misconceptions. The study is framed in the literature on instructional change and it highlights the challenges in reaching the Common Core State Standards (CCSS) deeper learning goals (Heritage, 2013; Herman, 2013).