Man-in-the world becomes man-at-the-world through acting on the world. It is this "action-reflection" on the world we can call "work" or "labour". Work being the central reference point of human history, the structure and modalities of work organization in the context of a particular mode of production constitutes the micropraxis of alienation. This paper examines the modalities of work organizational structures and processes in feudal, capitalist and socialist modes of production.