In addition to these legal systems there are criteria for grouping the legal systems of different states, among which we mention the procedural systems, notarial systems, systems registration, systems of government, among other systems, noting that in many cases systems are devoted not only opposed but also mixed systems. That is, in some cases legal term confuses the legal system with legal family, so we must distinguish at this venue. The first is comprised of the right of each state, in this sense we can study the Peruvian legal system, Chilean, Argentinian, Spanish, Italian, French, German n, among others, while the second is the group of legal systems in such If we speak of Roman legal family German unique, the common law, Soviet religious systems, among others.
Luis Diez Picazo policy states that all inharmonious not be regarded as heterogeneous. Also needed but often within the entire set without full rationality entertaining as a specific logic, since many of the above rules and different historical moments have been due to impulses or motivations of different sign, the set of standards to be incorporated or seek to be integrated into a system. Although not a priori, that all its different parts are not linked to each other from the standpoint of strict logic, we must understand that it is to the extent that all parts should be marked by internal consistency and be supportive to each other, so that the whole can be considered as what has been called a modern structure.