1) SIMON H. A. The Sciences of the Artificial (Third ed.). The MIT Press. (1996)
2) RITTEL H. Planning problems are wicked problems. Developments in Design Methodology. John Wiley & Sons. (1984) p.135-144.
3) SCHOEN D. A. The reflective practitioner. How Professionals Think in Action. Basic Books. (1983)
4) REISBERG D. External representations and the advantages of externalizinag one's thoughts. Proc. of the 9th Annual Conf. of the Cognitive Science Society Cognitive Science Society. (1987)
5) BRUNER J. The Culture of Education. Harvard University Press. (1996)