Our global objective is to propose models and functional architectures for the open and distance learning (ODL) systems that are elaborated from the practices observed within a company marketing ODL platform-based solutions. Therefore it is a re-engineering process whose characteristic feature is to embrace the overall open and distance learning life cycle.
In this paper, we focus on the concept of activity. A lot of propositions are centered on the learner's activity. First we describe how the concept of activity is used in some representative models in existing literature, then we propose a more extensive model of activity that covers all the actor's activities involved in the open and distance learning production process. Finally, we show how this model is used in several situations.
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