Abstract
This paper describes discussions about a framework of design methodology based on emergent design and optimum design. Concretely, a framework of design methodology is proposed by introducing a viewpoint considering the design process and a framework of design theory (Multispace design model) to emergent design and optimum design. Emergent design has a bottom up process and top down process as seen in Emergence. On the other hand, the optimum design has a top down process, which possesses reductionistic features. As a result, it is described how design methods can be grouped into two categories: an emergent-focus method and optimum-focus method. Moreover, two effects are discussed on the basis of the proposed framework.
