  In what does self-determination consist? A classic distinction separates “human acts” (actus humani) from so-called “acts of man” (actus hominis). An act of man describes something that “happens” in the subject whereas a properly human act ascribes free and responsible authorship of the act to the subject. The element of interior causality is referred to as self-determination. This self-determination involves a sense of efficacy on the part of the acting subject, who recognizes that “I act” means that “I am the efficient cause” of my action. One’s sense of efficacy as an acting person in relation to the action performed is in turn closely connected to one’s sense of responsibility for the activity. This experience on the phenomenological level draws attention to the will as the person’s power of self-determination, while at the same time making clear that self-determination is a property of the person himself, and not just of the will. It is the freedom of the person as such, through his will.