This is the fourth of the biennial Experimental Robotics symposia which are designed to bring together, in a small group setting, researchers from around the world who are at the forefront of experimental robotics research. The symposia are designed to provide a forum for the presentation and discussion of research in robotics that focuses on theories and principles which have been experimentally validated. This proceedings volume includes the fifty-five contributions that were selected by the International Program Committee for presentation at the symposium. The contributions represent work in the areas of design, perception, control, planning, and robotic applications and are organized into twelve broadly-defined chapters for ease of reference. Research groups from twelve different countries have contributed to this work.