This study focuses on how knowledge is produced and distributed among participants with different skills and knowledge bases, how knowledge is distributed through designers, tools and representations to define the role and tasks of each team participant, and the nature of interaction within the team focused cognitive system. The thesis explores cases involving computational tools in architectural design using ethnographic methods, focusing on understanding how a distributed cognitive system facilitates multidisciplinary collaboration within design teams. One aspect of the study delves into designers' use of computational design tools in a collaborative work environment, seeking to comprehend how these tools enable serendipitous design explorations. The team's management of design development processes and serendipity is analyzed, particularly how the system generates multiple alternatives in an explorative setting, which influences the extent of exploration. Second, the thesis focuses on generating and evaluating alternative design options in computational design applications. Office and team leaders play an important role in making the design idea and process more legible and transparent for team participants, clients and consultants. The study also explores how design ideas are represented and externalized in the distributed cognitive system to achieve a legible schema that guides the design process. It is important to recognize the space in which they can improvise, along with the transparency of the design process, among team participants who specialize in different fields. Third, the study explored various aspects of computational applications in architectural design and their impact on collaborative processes within distributed cognitive systems. By examining the interactions between multidisciplinary team participants and the role of both digital and non-digital tools, the research provides insights into how multidisciplinary design teams navigate in their creative activities. Keywords: Distributed Cognition; Architectural Design Teams; Computational Design; Design Process; Design Cognition.