Quelle In: Vosniadou, Stella; de Corte, Erik; Glaser, Robert; Mandl, Heinz (Ed.), International perspectives on the design of technology-supported learning environments (S. 307-321). ###>Source In: Vosniadou, Stella; de Corte, Erik; Glaser, Robert; Mandl, Heinz (Ed.), International perspectives on the design of technology-supported learning environments (S. 307-321).