The Project Group SmartSE is currently at the beginning of its third project phase. The group develops recommendations for process design, pursues technical standards for the collaborative development of complex mechatronic systems and supports the internal and cross-enterprise creation of transparency with regard to systems engineering objects. Focus is placed on the hotspot of SE challenges: the exchange of behavior models between partners in the product development process. Use cases were therefore defined and specified on the basis of the V model for product development that pay particular attention to interaction between E/E development and development on the basis of other physical domains.