In this study, I provide a microgenetic-historical account of learning in an informal setting: the conceptual change that occurred while a university-based scientific research laboratory investigated the absorption of light in rod-based photoreceptors of coho salmon, which the "dogma" had suggested to be related to the migration between…

Geometry, classification, and the classification of geometrical objects are integral aspects of recent curriculum documents in mathematics education. Such curriculum documents, however, leave open how the "work" of classifying objects according to geometrical properties can be accomplished given that the knowledge of these properties is the…

Describes an epistemological framework and an associated research method. The framework focuses on the structural relations of individual and setting as experienced by the individual. The analysis consists in zooming to identify patterns that simultaneously occur at multiple levels. Uses data from a physics classroom where students learn to…

Investigates how the content and form of classroom discourse is influenced by different combinations of artifacts (e.g., overhead transparencies, physical models), social configurations, and physical arrangements. (Author/CCM)