In many science, technology, engineering, and mathematics (STEM) domains, instruction on foundational concepts heavily relies on visuals. Instructors often assume that students can mentally visualize concepts but students often struggle with internal visualization skills--the ability to mentally visualize information. In order to address this…

Discursive formative assessment (FA) practices during instruction have grown in importance in the education literature as a way of improving teaching and learning. This study involves three years of design-based research as part of an educational project. We examine lower secondary school teachers' qualitative Informal Formative assessment (IFA)…