For the cooperative design activities by a design team, a designer needs design object information not only about geometrical data and these attributes but also the design rationale such as the reason of decision making to understand ideas of the design proposes by other designers. This paper focused on influential relations between parts of design object, and proposed descriptions and management methods of these relations. The management support system was developed, and case studies are done by using the system. As a result, the proposed method can support to manage the influential relations, and this also shows the proposed method have an applicable possibility to transmit design rationale to other designer.
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