The logic of the theoretical study of the legal liability urges on starting with the determination of its meaning as a kind for other phenomena that represent the species. This necessity is a result of the lack of consensus regarding the formulation of a unique definition for the liability in general and within the branches of law, the lack of a common point of view, at least from a principled perspective, as for instance, the legal nature of the legal liability and its place within the legal regulation mechanism etc. Nonetheless, the legal liability represents per se one of the fundamental institutions researched and used by the theory of law and legal sciences. The content of the legal liability determines the essence of its implementation mechanisms, its place and role within the legal system in general. Therefore, the question what we mean by the notion of legal liability, what is its essence, represents an issue of a methodological nature of any fundamental or applicative research.