In a collaborative situation, involving several partners, a BPM approach may be useful to support the design of a Mediation Information System (MIS), in charge of ensuring interoperability between partners' IS. For such an objective, there are two main barriers, which are: (i) building collaborative business process cartography, and (ii) once the collaborative business process cartography defined, fill the deep semantic gap between business activities and technical web-services. This articles aims at presenting state of the art, results and current works concerning both these critical issues.