Abstract
In the study we report in this chapter, we investigate the competences of mathematics pre- and in-service teachers in diagnosing situations pertaining to mathematics teaching and in offering feedback to the students at the heart of said situations. To this aim we deploy a research design that involves engaging teachers with situation-specific tasks in which we invite participants to: solve a mathematical problem; examine a (fictional yet research-informed) solution proposed by a student in class and a (fictional yet research-informed) teacher response to the student; and, describe the approach they themselves would adopt in this classroom situation. Participants were 23 mathematics graduates enrolled in a post-graduate mathematics education programme, many already in-service teachers. They responded to a task that involved debating the identification of a tangent line at an inflection point of a cubic function through resorting to the formal definition of tangency or the function graph. Analysis of their written responses to the task revealed a great variation in the participants’ diagnosing and addressing of teaching issues – in this case involving the role of visualisation in mathematical reasoning. We describe this variation in terms of a typology of four interrelated characteristics that emerged from the data analysis: consistency between stated beliefs/knowledge and intended practice, specificity of the response to the given classroom situation, reification of pedagogical discourses, and reification of mathematical discourses. We propose that deploying the theoretical construct of these characteristics in tandem with our situation-specific task design can contribute towards the identification – as well as reflection upon and development – of mathematics teachers’ diagnostic competences in teacher education and professional development programmes.
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Notes
- 1.
The original version of the task is in Greek. The term didactical in the context of this task, and more broadly in the context of the post-graduate programme attended by the participants, is used to denote pedagogical strategies related to specific mathematical topics (as in, for example, didactics of Calculus). In the programme the term was also used with the sense that it has within the Theory of Didactic Situations (Brousseau, 1997), for example, as in didactic contract.
- 2.
Our use of the term “reification” takes cue from discursive perspectives such as Sfard’s (2008) where reification is defined as the gradual turning of processes into objects. Discourses, Sfard writes, change in a “chain of intermittent expansion and compression” (p. 118). Reification is the key element of compression which can be endogenous – resulting from saming within one particular discourse – and exogenous which “conflates several discourses into one” (p. 122). Reification is a response to what discursive researchers see as our innate “need for closure” (p. 184) in our use of signifiers and brings at least two potent gains: increasing the communicative effectiveness of discourse and increasing the practical effectiveness of discourse. In our analyses, we are interested particularly in the extent, and ways, in which participants’ discourse (for example, as evident in their use of mathematics education terminology) is reified.
- 3.
If f is a function such that there exists f(k)(x0) for every 1 ≤ k ≤ n, the Taylor polynomial of degree n for f at x 0 is the polynomial \( {T}_{n,{x}_0}(x)=\sum \limits_{k=0}^n\frac{f^{(k)}\left({x}_0\right)}{k!}{\left(x-{x}_0\right)}^k. \)
It is the only polynomial (degree at most n) with the property \( \underset{x\to {x}_o}{\lim}\frac{f(x)-{T}_{n,{x}_0}(x)}{{\left(x-{x}_0\right)}^n}=0 \) and it is the best polynomial approximation of f degree n at the point x 0. For n = 1 this polynomial approximation, f(x 0) + f ′(x 0)(x − x 0), is of degree one, therefore a line. The term local straightness, expresses this in visual terms: locally, the linear approximation of the curve and the curve itself are indistinguishable.
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This study is partially supported by the grant of an annual Erasmus Teaching Staff Mobility programme that has been in place between our institutions since 2002.
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Biza, I., Nardi, E., Zachariades, T. (2018). Competences of Mathematics Teachers in Diagnosing Teaching Situations and Offering Feedback to Students: Specificity, Consistency and Reification of Pedagogical and Mathematical Discourses. In: Leuders, T., Philipp, K., Leuders, J. (eds) Diagnostic Competence of Mathematics Teachers. Mathematics Teacher Education, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-319-66327-2_3
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