Collaboration is the basis for conceiving, coordinating and implementing the tasks associated to complex goals. Collaboration is pervasive: there is practically no human challenging domain that is not influenced by collaborative processes, in particular Education in formal and informal settings. For these reasons we have to consider collaboration at a distance as a "new" key phenomenon that deserves to be studied, thus modeled in order as much as possible to foresee its effects. In the global village, synthetically represented by "the Web", many collaborative contexts exist; each with its properties. In all these different contexts where the collaboration quality depends on some particular property like the collaboration goal, tasks, and constraints, classical performance evaluation methods are not adequate and cannot be applied directly. In this paper, we discuss a new e-collaboration evaluation approach based on the analysis of scenarios.