A sociocultural perspective considers science textbooks as 'cultural supportive tools' with significant cultural missions. By juxtaposing symbolic, mathematical, and visual-graphical text, textbooks present the intertexts deployed by the scientific community to convey conceptual understandings in a way that no one form can. Intertextuality entails…

Many students do not experience usefulness in mathematics. To address this problem, we offered them a mathematical tool, Sankey diagrams, which is a flow chart appearing in news media to visualize social, industrial or environmental processes. We carried out an Educational Design Research (EDR) to develop and evaluate lesson materials about…

This paper articulates a perspective on learning to discuss ways in which students develop personal sense and negotiate meaning in a middle school algebra context. Building on a sociocultural perspective that incorporates mental objects, learning is described as a mutually dependent process involving personal sense making and the public…