The model of the territorial process developed by the Italian school of process-based typology is founded on the stratification of historical phases according to a principle of organicity, through which the different anthropic structures are linked to each other, as well as to the natural structure, by relations of necessity. The application of this model for interpreting the territorial process of the mountains of Ouled Nail and Djebel Amour in Algeria encountered several difficulties because of its steppe nature dedicated to the movement of populations. Thus, the notion of historical phase has difficulty in revealing itself with as much clarity as in the theoretical model, because of the incomplete and therefore heterogeneous occupations.