1) Austrian School 2) The study of human conduct 
Praxeology (Gr. πρᾶξις (praxis) ″action″, λόγος (logos) ″talk, speech″) is the deductive study of human action based on the fact that humans engage in purposeful behavior, as opposed to reflexive behavior like sneezing and inanimate behavior. According to adherents, with the action axiom as the starting point, it is possible to...
study of practical or efficient activity; science of efficient action
the study of human conduct.