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This study examines the design and enactment of a secondary physics unit on electromagnetism. The unit used an educational videogame to support peer dialogic engagement in a Singapore secondary school by engaging learners with qualitative physics phenomena. As an example of game-based learning, the unit includes activities and resources that organize a recurring progression of playing and interacting around science that we term "play-centered cycles." We incorporate two complementary, qualitative analyses to consider how a recurring progression of playing with and talking about science-mediated peer dialogic engagement across two separate classes. Findings demonstrate that peer dialogic engagement occurred within each play-centered cycle for both classes but that the nature of such engagement varied across cycles and student teams. Additionally, comparative case analyses of focal teams' peer dialogic engagement illuminate how the design of play-centered cycles productively supported play and learning while also highlighting emerging tensions for sustaining dialogic engagement. Findings underscore the plausibility of this approach to fostering science learning by articulating two principles for designing science learning environments that can guide ongoing efforts to enlist videogames and play in the service of talking about and learning science.

As an example of design-based research, this study refined an assessment strategy for simultaneously enhancing inquiry-based learning and supporting achievement on conventional assessment measures. "Astronomy Village[R]: Investigating the Universe[TM]" is a software program designed to engage secondary science students in authentic and inquiry-based learning over core topics in astronomy. The software was enhanced with a 20-hour curriculum and three levels of assessment to ensure successful inquiry experiences "and" high-stakes achievement. The first year implementation of Astronomy Village[R] yielded significant gains on a curriculum-oriented exam but not a standards-oriented test, and provided useful design insights that were integrated into the second year implementations. Significant gains were obtained on the test during the second year as well. It is expected that many existing inquiry-oriented science curricula might be similarly enhanced, and is suggested that a large-scale effort to do so might have a lasting impact on science education.

This study details an innovative approach to coordinating and enhancing multiple levels of assessment and discursive feedback around an existing multi-media curricular environment called Astronomy Village®. As part of a broader design-based research programme, the study analysed small group interactions in feedback activities across two design cycles. The goal of this analysis is to develop an understanding of the ways that a situative approach to assessment and practise supports learning. Findings demonstrate ways that student and teacher engagement in collaborative activities support and constrain meaningful understanding, which we consider in terms of a trajectory of participation in and across conversations and written assessments, as well as individual learning gains on formal classroom examinations and standards-oriented external tests. Analyses of complementary formulations of domain concepts - discourse practises and assessment performance - suggest that participation in social forms of scientific engagement supports both learning and subsequent performance in more formal contexts. We suggest design principles for integrating the formative functions of discursive feedback with the summative functions of traditional assessment, through participation in different forms of science discourse(s). [ABSTRACT FROM AUTHOR]