1. Abrahamson, D. , Blikstein, P. , & Wilensky, U. (2007). Classroom model, model classroom: Computer-supported methodology for investigating collaborative learning pedagogy. In C. Chinn , G. Erkens , & S. Puntambekar (Eds.), Proceedings of the Biennial Conference on Computer Supported Collaborative Learning (pp. 49–58). New Brunswick, NJ: Rutgers University.