This qualitative study explores how middle school students in the Western United States participated in a curricular unit that focused on action for socioenvironmental sustainability. Using inductive coding and building on prior research, I examined actions that students took during this sustainability unit and how students talked about action…

This study aimed to determine the cognitive process employed in problem-solving related to the concept of area conservation for seventh graders. Two students with different mathematical ability were chosen to be the subjects of this research. Each of them was the representative of high achievers and low achievers based on a set of area…

Using the US national sample from the Third International Mathematics and Science Study (TIMSS) and the Rasch modeling method, this study identified the conceptual progression sequence of various matter concept aspects, and compared students' latent abilities against the sequence. We found that the four matter aspects, i.e. conservation, physical…