One: The Origin of Praxiology; Praxiology as the Science of Functions [excerpts]; The Origins of Technology [excerpts]; Two: Science of Human Action; The Action [excerpts]; The Phenomenology and Ecology of Acts [excerpts]; Three: Action Theory and Its Applications; Scientific Organization of Work and Management [excerpts]; The Science of Decision-making [excerpts]; The Structural Analysis of Actions and Its Social-psychological Aspects [excerpts]; An Essay in “Epistemo-praxiology”