The Parliamentary Committee on Decentralization, Local Administration, and Special Local Governments of the House of Representatives of Thailand with the support of the Konrad Adenauer Foundation Thailand Office publishes this guidebook aiming at supporting academic work on local administration and decentralization in Thailand as well as local participation and people’s voting rights. Focus in this publication is therefore dissemination of the knowledge about the concept, principles, and different steps of decentralization processes in order to encourage a constructive discussion on this topic in Thailand. The contents in the book will also become an academic reference for Thai officials at the national and local levels, members of the House of Representatives and Senate, as well as academics, students, and the general public interested in decentralization policies, good governance, and citizen participation in public policies.