Every social situation finds itself in a determined h.m. wherein diverse generations coexist. An h.m. is differentiated from another when a rupturist generation disputes the power of the generation that holds it. Given a rupture, the conditions are present in the new h.m. for processing a new stage of greater breadth, or for the simple mechanics of the generational dialectic to continue. The h.m. appears as the minimal system of a structure configured by the generations that coexist, in relationship with the structure of their corresponding sociocultural (landscape) environment. Grasping this minimal system is necessary for the comprehension of a historical process. In other words: the coexisting generations and their surrounding landscape are the dynamic structures of the minimal system called h.m.