The role of analogies and metaphors has played a significant part in the work on teaching and learning science. This commentary discusses three papers from this current issue that cover a wide range of studies in the spirit of conceptual metaphors--ranging from a study somewhat similar to "classical" conceptual change, to a teacher…

This document reorts on an educational research study involving 75 eighth-grade students to determine the effects of problem solving instruction on the ability of students to apply proportional reasoning in problem situations. Results suggest that changes in basic reasoning skills such as proportional reasoning are long term, highly dependent on…

The objectives of this study were to develop a method for scoring the level of abstraction (LOA) of science reading material and explore its relationship with other methods for assessing curriculum materials. LOA is defined as the ratio of the nonconcrete concepts to the total number of concepts in a written passage expressed as a percent.…

This article describes an extended collaboration between a development team and an evaluation team working with GenScope, an open-ended exploratory software tool. In some respects, this was a routine evaluation, documenting substantial gains (of roughly 1 SD) in genetics reasoning ability in all but 1 of 17 classes, despite challenges presented by…