Praxeology - Wikipedia

Not to be confused with Practice theory, which is also called praxeology. In philosophy, praxeology or praxiology (/ˌpræksiˈɒlədʒi/; from Ancient Greek πρᾶξις (praxis) 'deed, action', and -λογία (-logia) 'study of') is the theory of human action, based on the notion that humans engage in purposeful behavior, contrary to reflexive behavior and other unintentional behavior. French social philosopher

[contractio]

「The popular definition of this word was first given by Alfred V. Espinas, the forerunner of the modern Polish school of the science of efficient action. The Austro-American school of economics was also based on a philosophical science of the same kind.」