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The aim of the study is to explore how the modelling, as a condition for theoretical abstraction and generalization, takes shape in a certain sequence of a biology instruction based on the El’konin-Davydov Program. Research questions are: How are the students’ diagrams handled in the modelling process? What is the character and the function of the teacher’s questions and actions during the modelling process? The data consists of teachers’ lesson plans and fieldnotes related to a certain modelling carried out in several classes. Based on the results of the analysis we conclude that the students’ diagrams are used as means of the collective process of abstraction towards the generalized model. The teacher organizes and leads the modelling process so that theoretical abstraction becomes possible; thus, the students discern the general in the specific case and begin developing a theoretical concept.

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