The objective of this work is to characterize the use of a learning trajectory of length and its measurement as a conceptual instrument to favor the acquisition of the teaching competence "to look professionally" at children's mathematical thinking. Participated 64 students of the early childhood education teacher career who followed a teaching module. This module was articulated around a learning trajectory about length and its measurement, so that future teachers would use it as a conceptual instrument to describe and interpret the responses of children in early childhood education to teaching-learning situations (first scheme instrumental action) and propose tasks based on the inferred understanding (second instrumental action scheme). The results show that there are students who are preparing to be teachers who do not develop any instrumental action scheme, and others develop the first scheme and some, both; this provides evidence of the acquisition of the aforementioned competence.
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