The research is aimed to 1) analyze a communication process of the owner of the Chao Phraya for All (CPA) Project for establishing the stakeholders’ participation in playing their roles in the environmental impact assessment (EIA) process, 2) analyze and recommend an effective communication process in the EIA for a mega project in Bangkok, and 3) analyze the use of new media in the EIA process. The study was conducted by qualitative research through documentary analysis and in-depth interviews with stakeholders. However, since the question on ...