is the study of human action, based on the notion that humans engage in purposeful behavior, as opposed to reflexive behavior like sneezing and unintentional behavior.
French social philosopher Alfred Espinas gave the term its modern meaning, and its study was developed independently by two principal groups: the Austrian school created by Ludwig von Mises and the Polish school created by Tadeusz Kotarbiński.
Praxeology is the scientific study of human action, which is purposeful behavior. A human acts whenever he or she uses means to achieve an end that he or she subjectively values. Human action is thus teleological or intentional; a person acts for a reason. Not all human behavior is action in the praxeological sense: purely reflexive or unconscious bodily movements (such as coughing when exposed to tear gas) are not examples of action. Praxeology starts from the undeniable axiom that human beings exist and act, and then logically deduces implications of this fact. These deduced propositions are true a priori; there is no need to test them in the way that a physicist might test a proposed "law" of Nature. So long as a praxeological statement has been derived correctly, it must necessarily contain as much truth as the original axioms.[1]
For example, when we throw a ball, we do not reason that it is guided in a teleological way by some mystical spirit or "prime mover." Instead we use the laws of mechanics and causality to examine the position, velocity, and forces acting on the ball, in order to predict the future position and velocity of the ball.
On the other hand, one does not reason that there is some sort of direct, causal relation between traffic lights turning green and bodies beginning to cross the road. These are individuals acting with purpose crossing the road, who, only when the lights turn green, reason that it is safe to cross and then proceed to do so. The reckless individual who is late for work may rush across the road regardless of what the traffic lights show.
https://mises.org/library/praxeology-methodology-austrian-economics