An Architecturally Situated Approach to Place-based Mobile Interaction Design Mikael Wiberg, PhD Interaction Theory Lab, Department of Informatics, Umea University, Sweden mwiberg@informatik.umu.se Abstract. Today we can witness a trend within the area of CSCW towards design of smart environments, ubiquitous information landscapes, and location-based services. However, although all these efforts made concerns the blending of design of our physical surrounding with information technology and although we have learned from the field of environmental psychology that places shape human behavior there has so far been few attempts made to explore the role of physical places in the shaping of everyday social interaction for the purpose of identifying implications for mobile and ubiquitous interaction design. In this workshop paper we present the ArchITechtum project in which we have approached this issue by taking on an architecturally situated approach to inform interaction design “in the wild”. The paper presents our project and the method applied followed by some preliminary results and a discussion of its implications for mobile interaction design. Introduction Places, we live our lives in them and they constantly surround us. Places are as such a ubiquitous phenomenon in our everyday lives. Places are also essential to us as human beings in many ways. Amongst other things, our physical surrounding play an important role in the everyday shaping of human social behavior, and can, according to previous empirical studies made, support close collaboration, brief communication, everyday socialization, and social interaction (Jones, et al 2005, p.19). As further pointed out by e.g. Jones, et al (2005, p.19), research from environmental psychology (e.g. Bell et. al, 2001; Bechtel &