**Acknowledgements**

Thanks to:

Professor F. Carvalho Rodrigues was responsible for encouraging and helped me the fulfill‐ ment of this vision.

[9] LidwellWilliam; Holden, Kritina; Butler, Jill (2003). *Universal Principles of Design: 125 ways to enhance usability, influence perception, increase appeal, make better design decisions,*

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[10] LindsayPeter H., Norman, Donald A. (1977). Human information processing: An in‐

[12] Melo-PintoPedro (1998). *Aplicação da Teoria das Crenças ao Reconhecimento Visual*, Uni‐

[14] Shafer, G. (1978). Non-additive probabilities in the work of Bernoulli and Lambert,

[15] Shannon, C. E. (1948). A Mathematical Theory of Communication". The Bell System

[16] YagerRonald R.; Fedrizzi, Mario; Kacprzyk, Janusz (1994). *Advances in the Dempster-*

[11] MaedaJohn (2006). *The Laws of Simplicity*. Massachusetts Institute of Technology.

*and teach through design*. Rockport Publishers.

troduction to psychology, Academic Press.

versidade de Trás-os-Montes e Alto Douro, Vila Real. [13] NormanDonald A. (2004). *Emotional Design*. Basic Books.

*Archive for History of Exact Sciences*, 19 , 309-370.

Technical Journal, 27, July- October., 379-423.

*Shafer Theory of Evidence,* Wiley.

Martim Lapa, for his admirable staying power to support me to translate this version.

Professor Denis A. Coelho for editing the manuscript.

Finally, I would also like to thank the UNIDCOM/IADE.
