This book examines the evolution of the concept of participation by underlining its theoretical and technical pros and cons. Moreover, it puts in evidence that participatory processes in public decision-making show significant implementation difficulties. In this context, the book examines the emblematic case of the Sardinian Regional Landscape Plan (RLP). PUBLISHER'S NOTE: the PDF version of this ebook is readable on a Pc, Mac and tablet; all the other versions are optimized for reading on a tablet.