In this paper we present a use trace model which allows the collection and reuse of user experience, based on a homogeneous and interconnected representation of users, procedures and objects. All these notions form a connected labeled directed graph containing highly connected and explained use traces. This model enables assistance in non trivial, creativity requiring situations. Our model uses the Case Based Reasoning (CBR) paradigm in order to reuse experience. After a formal description of the model we discuss how it can serve to capitalize and re-use experience.