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Dialogue, as a communication form characterized by its commitment to inclusiveness and rationality, has long been advocated by educators as a mechanism for helping students become better thinkers. Unfortunately, numerous claims about the educational potential of participating in dialogue have not resulted in substantial changes in classroom practices. Studies have consistently shown that in today's schools the dominant discourse remains largely monologic. In this article, we present a testable theory of change that suggests how sociocultural processes in a dialogic classroom influence students’ development. We identify and discuss three learning outcomes of dialogic teaching, including epistemological understanding, argument skills, and disciplinary knowledge. We then critically review empirical research related to the proposed theory, highlighting unsolved questions, inconsistencies, and directions for …