‘Warrant’ revisited: Integrating mathematics teachers’ pedagogical and epistemological considerations into Toulmin’s model for argumentation Article First Online: 06 August 2011 DOI :
10.1007/s10649-011-9345-y

Cite this article as: Nardi, E., Biza, I. & Zachariades, T. Educ Stud Math (2012) 79: 157. doi:10.1007/s10649-011-9345-y
Abstract In this paper, we propose an approach to analysing teacher arguments that takes into account field dependence—namely, in Toulmin’s sense, the dependence of warrants deployed in an argument on the field of activity to which the argument relates. Freeman, to circumvent issues that emerge when we attempt to determine the field(s) that an argument relates to, proposed a classification of warrants (a priori , empirical , institutional and evaluative ). Our approach to analysing teacher arguments proposes an adaptation of Freeman’s classification that distinguishes between: epistemological and pedagogical a priori warrants, professional and personal empirical warrants, epistemological and curricular institutional warrants, and evaluative warrants. Our proposition emerged from analyses conducted in the course of a written response and interview study that engages secondary mathematics teachers with classroom scenarios from the mathematical areas of analysis and algebra. The scenarios are hypothetical, grounded on seminal learning and teaching issues, and likely to occur in actual practice. To illustrate our proposed approach to analysing teacher arguments here, we draw on the data we collected through the use of one such scenario, the Tangent Task. We demonstrate how teacher arguments, not analysed for their mathematical accuracy only, can be reconsidered, arguably more productively, in the light of other teacher considerations and priorities: pedagogical, curricular, professional and personal.

Keywords Teacher knowledge and beliefs Freeman’s classification of warrants Toulmin’s model for argumentation Practical rationality of teaching Visualisation Example use Tangent line

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Authors and Affiliations 1. School of Education University of East Anglia Norwich UK 2. Mathematics Education Centre Loughborough University Loughborough UK 3. Department of Mathematics University of Athens Athens Greece