IT Professional societies have struggled to identify a meaningful Body of Knowledge that should be mastered by all IT Professionals. The two leading US societies for IT Professionals, the ACM and the IEEE-CS, cooperated in the development of a major Computing Curriculum Report (CC2005). This report provides a useful graphical view of the “Problem Space of Computing”. They developed a two-dimensional model, with a theoretical-to-applied horizontal dimension, and five vertical areas of concentration. It was represented as: