The City Development Index is based on three main domains (i.e., social, economic, and cultural) and their sub-dimensions. These three domains correspond to the three main structures upon which all cities throughout history have been built and that ensure the continuity of a city’s social reality. In addition, these three basic domains also have their own dimensions. Ideally, urban development basically depends on the harmony among these three elements and the balanced distribution of their measurable sub-indicators.