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The normative models guiding the purposeful activities of the building industry client have been presented. In particular, more attention needs to be paid to clients at the pre-project stage because in general, occasional clients show a lack of knowledge at this stage. To counteract the lack of knowledge, theories and practices of knowledge management (KM) can provide a logical means to support them. The reviews of knowledge theory and KM suggest that knowledge should be approached as streams (or flows), rather than assets to manage; people-bound aspects, such as attitude and behaviour, should be considered with system-bound aspects. Given that necessary knowledge for clients also flows at the societal level, in order to sustain the knowledge streams for them, two approaches to cultivate context are suggested: Market-approached context, where the service providers maintain knowledge for marketing and network-approached context, where the clients provide knowledge for maintaining reference power. This paper presents a scheme to facilitate knowledge streams of clients based on these two concepts. In order to validate the feasibility of scheme and to clarify the limits, a prototype of information systems that are enabling sustainable knowledge streams are implemented for a specific group of clients, housing cooperatives in urban renewal areas, Busan.