This paper argues that science education has overemphasized the importance of construction at the expense of critique. In doing so, it draws on two key premises--Ford's argument that the construction of knowledge requires a dialectic between construction and critique and Mercier and Sperber's theory of argumentative reasoning that critique is…

In this paper, we discuss the process of identifying and validating students' abilities to think proportionally. More specifically, we describe the methodology we used to identify these proportional reasoning attributes, beginning with the selection and review of relevant literature on proportional reasoning. We then continue with the…

This paper examines the role of scaffolding in the process of abstraction. An activity-theoretic approach to abstraction in context is taken. This examination is carried out with reference to verbal protocols of two 17 year-old students working together on a task connected to sketching the graph of |f|x|)|. Examination of the data suggests that…