I would like to thank all the people who helped me in some way in my research on LCPs. First of all, Axel Posluschny, who initiated my interest in this topic, invited me to Frankfurt to test LCPs with his commercial GIS software, contributed many valuable comments, and provided me with many references. I thank Silvia Polla and Philip Verhagen for their invitation to the inspiring workshop on least-cost issues in Berlin, and Andrew Bevan for fruitful mail discussions and providing me with references. Other colleagues who discussed these issues with me or sent references relevant for this publication include Benjamin Ducke, Karsten Lambers, Martin Sauerbier, Ingo Eichfeld, Tim Kerig, Martin Behnisch and Petra Dittmar. Moreover, I thank the anonymous referees.