A method for an assessment of a movement of a limb-related point (32) in a predetermined 3D space effected by a user displacing said limb (15) in the 3D space allowing said movement, comprises the steps of: providing a computer, providing one or more display surfaces (105) around the 3D space around the user (10), providing a limb position point (22) connected to a predetermined portion of the limb (15) of the user (10) which is associated to the limb-related point (32) and providing sensors adapted to detect the position of the limb position point (22) in the 3D space in relation to the joint (31). The computer program can be adapted to calculate the direction defined by the straight line (30) between the joint (31) and the limb-related point (32) and to provide a representation of the position of the limb-related point (32) in the 3D space as function of the distance (35) between said joint (31) and the limb-related point (32) on one of the display surfaces (105) on said line (30).
