“ Building is such a familiar activity that few people yet realize the highly divided character of knowledge of it at the level of professional competence or give much thought to the improvements than can and must be made”. (1) A building is a shelter from the external environment. The external environment was originally meant to define adverse climatic conditions caused by the sun, snow, wind, earthquakes, etc ., but it also includes in these days pollution, noise, war damage, and other man-made effects. The modern man also retreats to his home from the onslaught of socio-economic and psychological pressures of the surrounding society in which he is forced to earn his livelihood. It is of interest to recognize that the very house he builds as a shelter in turn affects the environment, often in an adverse manner, from which he is protecting himself. Thus the interaction between man – society – nature – shelter, and the networks he is using is complete. The evaluation of a housing complex shall then be based on these five fundamental aspects. Furthermore, the presence of these five aspects can be recognized in a single house, a colony of houses, a town, a metropolis, and so on. In the final analysis, the whole world is but a house in a broad sense. It was Doxiadis (2) who recognized the unifying characteristics of human settlements and it was he who once again identified the five basic interacting aspects namely Nature, Man, Society, Shelter, and Networks. It is proposed to explicitly deal with these five aspects in the procedure to be developed for evaluating housing systems.