However, the two distinctive models of the research design can be distinguished: the Family Deficit Model, on the one hand, and the Risk and Protective Factors Model, on the other. The former dates back to the 1970s, while the latter is associated with research trends of the 1990s. The Family Deficit Model stands out for the perception of the nuclear family, i.e. the family with both parents, as the ideal model of the family structure. Single parenthood, therefore, is viewed by this model as a negative environment for raising children, and relevant studies in the field aimed to demonstrate this assumption. The limitation of this theory manifests itself, however, in the lack of attention to other important factors, such as economic factors or other underlying factors, which have increasingly attracted the interest of academic research with single parenthood in