Abstract: It is described a 3D monocular tracking system, being robust, having low cost, easy to install and use, useful for the upper limbs rehabilitation in a patient in need thereof, as well as a home self-directed therapy method for patients having upper limbs' movement disability. The system comprising a) a handle or gripper; b) a computational vision system comprising a video camera; c) software comprising a set of games; d) a processor; and, e) a display apparatus.