Abstract
This paper proposes a conceptual framework for designing open collaboration platforms using examples from ICT platforms for earthquake disaster reconstruction after 3.11 in Japan. Recently, cross-organizational collaborations through ICT platforms are popular. However, how to design platforms for active collaborations has not been much developed yet. The paper argues the importance of "modularity of task" and "the degree of user participation defined by information reliability" as design parameters for open collaboration platforms. Findings in this paper have implications not only for earthquake disaster reconstruction but for general collaboration among groups or organizations.
