The rapid development and urbanization of Taiwan has produced scale, spillover and other dilemmas of fragmented authority that challenge efforts to address problems at a metropolitan or regional level. Taiwan municipalities have dealt with regional governance and institutional collective actions both across space and over time through the manners of consolidation. This paper describes the Institutional Collective Action (ICA) framework and its application to the study of collaborative mechanisms in metropolitan areas by drawing on examples of the tools of regional governance for solving ICA dilemmas in the Taiwan context. The author focuses specific attention on the role of policy network in integrating decisions in metropolitan areas.