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In the 1st-ever use of event-history analysis to investigate discourse processes quantitatively, this study recasts understanding of discourse in terms of the (a) antecedents and (b) consequences of discourse participant "moves" as they (c) affect the inertia of the discourse and accordingly structure unfolding discourse processes. The method is used to compute the probabilities of the effects of particular discourse moves on subsequent discourse patterns and to measure and systematically contrast static (macrosocial) and dynamic (microsocial) conditions prompting and sustaining dialogic discourse. Theoretically, the authors draw on Russian scholar Mikhail Bakhtin's epistemological distinctions between monologic and dialogic discourse to identify pedagogically rich sequences of teacher-student interaction as dialogic spells and discussion, which the authors' previous work has shown to contribute to achievement …