Le Vocabulaire progressif du français, niveau avancé avec

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In TeEl a sequence of four models is offered. In this sequence different perspectives on the model are offered, and even a system switch is made: the first two levels handle pressure distribution in a pipe, whereas the latter levels handle voltage and current distribution over a wire. The underlying model of these systems is the same. Learners see the same output representation for all model progressions: two arrays of sliders representing the pressure and velocity, or voltage and current, at various positions.

Ainsworth et al. describe two empirical studies of technology-based learning with multiple representations. The domain considered is number sense; an increasingly important aspect of mathematics education. It can be defined as a "sound understanding of the meaning of a number and of relationships between numbers, a good understanding of the relative magnitudes of numbers and awareness of numbers used in everyday life" (National Council of Teachers of Mathematics, 1989). Two aspects of mathematical understanding linked to number sense are the role of approximate solutions (computational estimation) and considering multiple ways to solve problems.

G. selective, ordered or quantitative variables), which it is essential to understand when processing a graph. In addition, these elements of the graphic sign system show that parsing information from a graph is a non-linear process that could not, for example, be talked about linearly over a phone line. Fourthly, a single graph can be processed and, thus, understood in multiple ways depending on the reader's level of expertise in the domain the graph represents and on the questions the reader has targeted to the retrieval of information from a graph (see Bertin, 1981, 1983).