In designing computer-human interface, the use of 3D graphic library such as was recommended to enhance its effectiveness[43]. More specifically, the 3D-facial displays are expected to more efficiently explain the speech production and the pronunciation problems[44]. In addition, some simplification of the terminology of the courseware and interface was also pointed out to be necessary, particularly for use by computer beginners. It was suggested that an on-line Help facility should be provided to allow the learners to obtain information at any stage of the learning paradigm.
