An important part of an interaction designer’s work is meeting with clients during design sessions. It is of great importance that the designers participate in establishing some level of common ground. This research aims at investigating how designer’s repertoire, in terms of facts, skills and examples, can help establishing common ground between designers and their clients. The research method is inspired by cognitive ethnography. Initial results from workshops, where interaction designers work together with participants from the Swedish Enforcement Authority, indicate that the interaction designers use examples from several design levels to establish common ground with clients and each other. Our future research aims to show how interaction designer and client work together in multidisciplinary teams.