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In this paper we propose a framework for modeling, representing populating and enriching knowledge from online collaborative sessions within Web forums. The main piece of the framework is an ontology called Collaborative Session Conceptual Schema (CS2) that allows specifying collaborative sessions. The paper describes the knowledge this ontology needs to know, the alignment of the ontology with the ontologies of relevant specifications, how the ontology can be automatically populated from the data existent in forums, and how to enrich such data into useful knowledge about what is happening during the collaboration. The research reported in this paper is currently undertaken within a FP7 European project called ALICE.