A structural/cross-sectional micro-analytic perspective prevails in the Socio-constructivist research of peer knowledge construction. This paper proposes an alternative micro-sequential approach that focuses on the transitions between events during the activity. From this micro-sequential perspective, the study aimed to (a) explore the socio-cognitive interaction of symmetrical dyads of sixth and seventh graders solving a table comprehension task; (b) compare this interaction between symmetrical dyads of basic and advanced levels of competence. Participants were 148 sixth and seventh graders (74 dyads) from public schools in Rosario and nearby areas (Argentina). The dyads were symmetrical because their integrants had similar specific levels of competence (comprehension of a frequencies table) but differed in basic and advanced compositions. The interaction was coded using a system of mutually exclusive and exhaustive categories. An analysis of transition probabilities was performed among all codes, to identify activated/inhibited and inter-subjective/intra-subjective sequences. Transitions between statements aimed at solving the task formed the core of interactivity, as they comprise the codes that play a greater role in the elaboration of the task (shared by both symmetrical conditions). However, only the basic symmetry dyads showed an activating effect of the social feedback units. Transitions between cognitive questions and statements were also registered. Opinion questions were the most activated (inter-subjective) compared to demonstration and evaluation questions. Although these transitions were inter-subjective, they also differed according to the condition of symmetry. The work allows drawing conclusions about the relevance of a micro-sequential approach to interaction, since these results could not have been constructed from a classical structural perspective.