The authors would like to recognize all the individuals who contributed, both directly and indirectly, to this book. We wish to thank all our colleagues, the current and past members of the Laboratory of Autonomous Mobile Systems, and the Laboratory of Modelling, Simulation and Control, Faculty of Electrical Engineering, University of Ljubljana, Slovenia, who inspired and contributed to this book. We are grateful to our colleague Dr. Matevž Bošnak for providing some insight into the field of assistive mobile robotics in walking rehabilitation therapy. Special acknowledgement goes to our former Head of the Laboratory, Prof. Dr. Drago Matko for introducing our laboratory into the field of mobile robotics. Our gratitude also goes to all graduate students, research associates and technical staff from the Faculty of Electrical Engineering, University of Ljubljana, and researchers from institutions around the world with whom we have been involved in a diverse range of projects that in a way also enabled creation of this book. We would like to thank Asst. Prof. Dr. Fernando A. Auat Cheein, Department of Electronics Engineering, Universidad Técnica Federico Santa María, Chile, for providing us with some material from his field of research, mobile robotics in agriculture. This work would have not been possible without support of the Slovenian Research Agency that backed many of our research and application projects.