This paper describes a computer-supported environment to facilitate distance learning through collaborative problem-solving. Our goal is to encourage distance learning students to work together, in order to promote both learning of collaboration and learning through collaboration. Collaboration means working together on a common problem, communicating and coordinating activities towards a shared goal. We propose a system embedding three models: an activity model, a domain model and a conversational model. The system can support asynchronous collaboration in a number of dimensions: giving structure to activities and communication to articulate the problem solving-task, supplying a share space to build jointly common knowledge, providing relevant know-how by case and techniques libraries and facilitating further reflection on the whole learning process
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