The main purpose of this contribution is to proof the tenability of the notion of trace as useful both to explain individual intentionality and to found a monistic ontological outlook on reality which guarantees the transition from the level of nature to the level of society. I argue that the notion of trace alone doesn’t suffice to give an account of the act side (i.e. quality) of intentionality and that an ontological treatment of the notion of person is requested (within the framework of Husserl’s theory of whole and parts and/or emergentism), since individual subjects play ultimately a crucial role in order to give life to social world.