Computer-mediated participation is at the crossroads. In the early heady days of the digital revolution, access to 'high' technologies such as GIS promised the empowerment of marginalized communities by providing data and information that was previously hidden away from public view. To a great extent, this goal has been achieved at least in the U.S. and Western Europe data about a range of government initiatives and raw data about different aspects of spatial planning such as land use, community facilities, property ownership are available a mouse-click away. Now, that we, the public, have access to information, are we able to make better plans for the future of our cities and regions? Are we more inclusive in our planning efforts? Are we able to foster collaborative governance structures mediated by digital technologies? In the book, these issues will be discussed using a three-part structure. The first part of the book will be theoretical it will review the literature in the field, establish a framework to organize the literature and to link three different subject areas (participation and community development, GIS and other related technologies, and planning processes). The second part of the book will be a series of success stories, case studies that review actual situations where participatory planning using GIS has enabled community wellbeing and empowerment. These case studies will vary in scale and focus on different planning issues (planning broadly defined). The final part of the book will step back to review alternative scenarios for the future, exploring where we are headed, as the technologies we are using to plan rapidly change.