Abstract
We elaborate on the notion of the instructional triangle, to address the question of how the nature of instructional activity can help justify actions in mathematics teaching. We propose a practical rationality of mathematics teaching composed of norms for the relationships between elements of the instructional system and obligations that a person in the position of the mathematics teacher needs to satisfy. We propose such constructs as articulations of a rationality that can help explain the instructional actions a teacher takes in promoting and recognizing learning, supporting work, and making decisions.
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Notes
We use constraint in the sense of bind or dependence, and without assuming that constraints are necessarily impediments. They can impede some things and facilitate others, just like the rules of a game do.
The content of studies is not the same as disciplinary knowledge, but the result of the process of didactic transposition (Chevallard, 1991) or alchemy of school subjects (Popkewitz, 2004). The two characteristics listed here are minimal in order to develop the instructional triangle so as to account for the work of the teacher. In an analysis of the knowledge itself, it would be desirable to make finer distinctions among these various versions of knowledge.
By norm we mean statements of behaviors that are unmarked or unremarked upon when participants do them but that call for elaborations or repairs by participants when those behaviors are missing. The word norm has thus an objective sense, as most frequent behavior in a recurrent social encounter, and a subjective sense, as behavior expected by actors of a recurrent social encounter. Herbst, Nachlieli, and Chazan (2011) show how norms can be empirically confirmed using an adaptation of the ethnomethodological practice of breaching experiments (Garfinkel & Sacks, 1970).
This use of situation and framing comes from interpretive sociology, dating back to the work of Goffman (1964/1997).
Examples of situations include “solving for x” in algebra I, “doing proofs” in high school Geometry; also calculating a measure and exploring a figure in middle and high school geometry, to mention a few.
Conceptions of task have also been proposed to examine teacher education (e.g., Zaslavsky & Sullivan, 2011) and teacher learning from teaching (Leikin, 2010) suggesting that task might be a more central notion than what we provide here. An examination of that issue is beyond the scope of this paper.
When Brousseau introduced the subject–milieu system, his main interest was in showing how adidactical situations could embody mathematical ideas. Thus, Brousseau’s emphasis was on the adidacticity of the milieu—the possibility that the student perceive the milieu as devoid of didactical (instructional) intention. In our account of “task” we continue to find helpful to speak about a milieu, though the milieu may or may not be adidactical. Clearly not all tasks are adidactical situations.
Needless to say, whatever individual students may actually do in response to whatever task is chosen is not determined by the norms of the task chosen in a situation.
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Acknowledgments
The ideas reported in this paper have been developed in part with the support of National Science Foundation Grants ESI-0353285 and DRL-0918425 to the authors. All opinions are those of the authors and do not necessarily represent the views of the Foundation. The authors thank Ander Erickson and three anonymous reviewers for valuable comments on an earlier version.
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Herbst, P., Chazan, D. On the instructional triangle and sources of justification for actions in mathematics teaching. ZDM Mathematics Education 44, 601–612 (2012). https://doi.org/10.1007/s11858-012-0438-6
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DOI: https://doi.org/10.1007/s11858-012-0438-6