Thematically aligned around the internet-based participation in land-use planning (Bauleitplanung), this volume deals with a highly topical and important issue. Namely the question of if and how the general public, and also the public authorities, can be involved more effectively in the process of land-use planning.The internet as a complementary medium offers various possibilities and compared to classic" public participation also offers potential for further improvement. For example, not only with respect to protests opposing to major development projects like "Stuttgart 21" it can be observed that the acceptance is an important indicator for a successful planning. This applies to land-use planning as well as to other mandatory participation processes (Fachplanungsrecht). By mainly focusing on legal matters this publication intends to make a contribution to the development of participation processes in land-use planning."