This article provides an overview of research into the use of a design method and its tool to explain and to illustrate the mental model of a design team. Purpose: to show a way to partly describe collaborative conceptual building design processes. Methodology: Our approach uses a design method to structure and to descibe the conceptual building design team process. This enables us to use it to illustrate the mental model of the design team. Findings: Our approach is usefull to let the designers reflect on the process as well as on the results. There is a stimulating effect of the method on the amount of solutions as well as on the communication within the design team. Value: The paper presents the application of tools of a design method to construct a mental model of a design team. This approach can be used to further investigate the creative processe within design teams.