Situated design is the planning method which addresses the latent value of planning process. The purpose of this paper is to make clear the significance of situated design, residents' sense of living together inspired by situated design, and the characteristics of interaction between person and physical environment through analysing the basic planning process of co-operative housing M-port. 1) Setting dialogue free makes participants to be quite in sympathy with each other, reaches gentle agreement of planning, and generates creative tension. 2) Situated learning, enjoying such action as, site watching and observation of other housings, imprints the life image and the meaning of living together on the form shows a strong tendency to succeed in this project. 3) Such situated design generates the elastic use of common space, leads participants to discovering metaphorical form of living together, and gives a house and common space individual character.
