This paper begins with a history of consolidation and decentralization in Denmark, following an analysis of the various actors participating in the planning process of the case study of Holmbladsgade Kvarterløft. Secondly, the Japanese consolidation and decentralization with emphasis on intra-city decentralisation is presented. This research report  briefly presents the current situation of decentralisation and consolidation in Japan with a given  example of public participation in urban planning in intra-city decentralisation in Setagaya-ward, Tokyo.  Finally this research report analyses the roles of local institutions with respect to public participations in urban planning in this ward.

In conclusion, various institutions and residents needed to be involved from an early stage of the planning process for comprehensive sustainable planning. Compatible to the Kvaeterløft program of Denmark that utilized local institutions, Japan should utilize its community, neighbourhood associations in a city for inception of urban planning for the present.