The Robotics, Perception and Real Time group of the University of Zaragoza, formed by 12 faculty members and around 20 students, is devoted to develop new techniques for autonomous robots and computer vision. The group has been working on several national and international projects about robot localization and map building. Results obtained have shown the possibility of robustly locating a mobile robot in a previously known indoor environments and doing simultaneous localization and map building in unknown environments using laser and vision sensors. Recently the group has developed a prototype of a wheeled chair with autonomous and semi-autonomous navigation capabilities in indoor and outdoor urban environments.