**2.1 The city as an urban phenomenon**

References of the urban phenomenon to the logic of form and to the dialectic of content justify its understanding as a system. These references impose relationships between the components of the urban phenomenon, so that they are realized in systems and subsystems. The urban phenomenon can be:


The urban phenomenon as a system is defined only through the urban form, the fact that leads us to the idea of knowing and directing the urban phenomenon (of its processes and acts) through careful, corroborated analysis of the manifestations of any kind of urban form [6]. The urban form has a dialectic character, which reflects the evolution of the urban phenomenon, it has:

a.The ability to express itself very differently either:


b.Graphically: by mathematical-geometric, technical, and plastic means

c.Verbally: by the psychosociological or mathematical-statistical concept

The urban form has the capacity to move from a logical, but an abstract manifestation (through a certain language), into a form of effective actions, which results in a certain urban existence. It had an active character which can highlight three sides:

