Situated within Sociocultural theory (SCT), this article analyzed an existing data set (Toth, 2021a(Toth, , 2021b(Toth, , 2021c, available at https://www.iris-database.org) to investigate learners' development through participation in a dialogic approach to grammar instruction called PACE. The target of instruction was the Spanish pronominal clitic se. Microgenetic analysis of the interaction between the teacher and learners was used to track two students' development during both small-group work and whole-class instruction. To analyze the process of development, evidence of obuchenie (i.e., teaching-learning activity) that preceded changes in each learner's performance was sought. These findings were compared to the two students' performance on a pre-, post-and delayed-intervention picture description task. Findings highlight the instances of mediation that promoted students' metalinguistic awareness and use of se. The article concludes with a discussion of the extent to which claims of development could be made based on the provided data set and considerations of the affordances of dialogic versus deductive explanations of grammar.
Keywords mediation; zone of proximal development; obuchenie; instructional conversations; conceptsWe would like to thank Paul Toth for the invitation to take part in this special issue, for sharing his meticulous data set, and for his many insights and contributions to our analysis and manuscript. We would also like to thank Richard Donato, Próspero García, and participants at the 2019 Sociocultural Theory and L2 Learning Working Group, whose ideas and mediation shaped this manuscript.