Asterhan, C. S. C., Schwarz, B. B., & Cohen-Eliyahu, N. . (2013). Conceptual change in proportional reasoning: Effects of collaboration, own/partner reasoning level and hypothesis testing. (M. Knauff, Pauen, M., sebanz, N., & Wachsmuth, I., Eds.)Proceedings of the 35th Annual Meeting of the Cognitive Science Society. Austin, TX: The Cognitive Science Society.