2004-2007 Supporting learning in text-based asynchronous learning networks: teacher presence and teacher functions in knowledge building processes
2002-2004 Interaction and educational influence: knowledge construction in electronic teaching learning settings
2002-2003 Guidelines for analisis intervention in virtual learning enviroments: rellevant dymensions and assessment tools
2002-2003 Learning in a Virtual Integrated University System, LIVIUS
1996-1998 Joint activity and talking strategies in checking and controlling shared meaning: learning assessment in school educational practices
1995-1996 Assessment of mathematics learning in compulsory education: psychopedagogical and curricular referent, normative referent and assessment practices
1993-1996 Assessment practice and the use of teaching materials in teacher-student interaction
1988-1991 Context, reference, and construction of meanings in educational interaction