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We describe two communication interfaces of the C-CHENE Computer-Supported Collaborative Learning (CSCL) environment that is used for solving physics problems at a distance in a network. The first manages text-based interaction using 'chat-boxes', and the second flexibly structures the interaction by providing a restricted set of communicative acts. Results of analyses of communicative acts generated in interactions with the two interfaces suggest that such flexible structuring may facilitate and encourage more knowledge-based and explanatory interactions, to the detriment interaction control acts and 'social' talk, where the former have been claimed to be more productive to learning in collaboration. In conclusion we briefly discuss an approach to generating automatic guidance based on forms of collaboration.
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