The full research project involves the observation and analysis of approximately 84 lessons, video-recorded and observed in situ with the set of guidelines generated. Preliminary results, based on approximately 37% of the sample, reveal public verbal participation, dominated by the teacher; the most usual mode of work involves the whole class; a low level of cognitive challenge; predominance of academic and cumulative talk. In most sessions, no scaffolding is observed; when it is present, it predominantly concerns conceptual aspects. With respect to materials, the most frequently used formats are "paper/cardboard" and the board, which are mostly prepared by the teacher. Their use is mostly "canonical" and "monomodal" in nature. There is little promotion of dialogicality in classrooms; nearly no strategies of collaboration promotion are observed. In most sessions, there is no socio-emotional scaffolding; when it is present, it predominantly concerns the identification of results and the explicit verbalization of the expected response.