Users' interactions with the environment (virtual, mobile...) foster the production of a wide range of data. Thanks to multi-user technologies, complex interactions occur. It is possible to aggregate the interaction data of the logfiles into a set of high-level of indicators. This is useful for environment designers.

Interaction Analysis Process (done by an interaction analysis tool): - data selection - data aggregation and processing - production of X indicators/variables that indicates "something" (like for instance the different variables in catchbob: performance, process, qualitative stuff...) - use these indicators: to self-confront the users with it (to foster verbalization) or to the teacher in a cscl environment...