It is generally accepted that there are three major categories of phonological elements in the signs of sign language: (i) the shape of the hand, (ii) the location of the hand on or near the body and (iii) the movement of the hand – either (a) movement of the fingers or palm at a single location or (b) movement of the whole hand along a path from one location to another. It has further been argued that each of these categories consists of hierarchically organised classes of features (Sandler 1987b, 1989a).