The calendar of events in the development of HIA in Thailand is summarized in Table 1. To facilitate HIA development, HSRI has organized three forms of related implementation bodies. First, an HIA coordination team was set up to bring together all HIA actions, as well as to develop new knowledge, information, and learning activities. Secondly, three HIA regional networks were established to support the learning process and the accumulation of a critical mass of knowledge in the regions. Lastly, five HIA thematic networks have been developed with the clear objective of creating a bridge between sound evidence and public policy formulation in different policy sectors.