Amy Soller Patrick Jermann Martin Muehlenbrock Alejandra Martínez-Monés Angeles Constantino González Alain Derycke Pierre Dillenbourg Bradley A. Goodman Katrin Gaßner Elena Gaudioso Peter Reimann Marta C. Rosatelli Ron Stevens Julita Vassileva Workshop on Designing Computational Models of Collaborative Learning Interaction. 915 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3220&spage=915 2004 conf/its/2004 Intelligent Tutoring Systems db/conf/its/its2004.html#SollerJMMGDDGGGRRSV04