**Acknowledgement**

The research presented in this chapter was developed as part of the first author's Master of Science thesis in industrial design engineering and as part of his ongoing doctoral studies, both supervised by the second author. A selection of results from the projects reported in this chapter have previously appeared in the conference papers Coelho & Versos (2010) and Versos & Coelho (2010), as well as in a peer-reviewed journal paper by Coelho & Versos (2011) published by Inderscience and in a peer-reviewed book chapter and a peer-reviewed journal paper by Versos & Coelho (2011-a, 2011-b) published by InTech and Common Ground, respectively.
