**3. A transfer skill system for teaching how to draw to unskilled persons**

As mentioned previously, the core idea is to use the HDS as a tool capable of interacting dynamically with the human on the basis of the action he decides to perform. The use of an automated system in the skill transfer process has several advantages: the process could be repeated indefinitely with a high level of precision, time and location flexibility, the user can improve its performance without the assistance of a teacher and his progress can be evaluated numerically through automated procedures.

The HDS aims to be an interactive bi-directional skill transfer system that can emulate the presence of a human assistant, guiding the user movements on the trajectories chosen by the user himself (Figure 14).

Fig. 14. Haptic Interfaces as assistant of abilities

In our previous research (Solis et al., 2002) it has been demonstrated the influence that proportional feedback programmed into haptic interface (HI) can have in the development of motor skills, in spite of this experiment was neither co-located nor coherent with the visual stimuli and only could assist to drawn a circle with fixed radio. The HD is our multimodal interface solution for teaches to design simple sketches.

We have developed two applications where the HDS assists the users in the sketching of simple drawings. The user interacts with the system through different means of feedback (visual, force, audio).
