I will begin by considering how the social world appears to the scientific observer and ask the question of whether the world of scientific research, with all its categories of meaning interpretation and with all its conceptual schemes of action, is identical with the world in which the observed actor acts. Anticipating the result, I may state immediately that with the shift from one level to the other, all the conceptual schemes and all the terms of interpretation must be modified.Proceeding (...) in this direction, I encounter several problems overlapping with the problem of rational action and the “rational act unit” in Professor ParsonsParsons, Talcott’ sense. First: The conceptual scheme of rational action presupposes a more or less definite knowledge of, or orientation within, the world in which this action is performed. In this sense the term, “rationality”, is not specific to the conceptual scheme of action; it embraces the conceptual scheme of the world in general and is only one element in it. Therefore, we also must examine the problem of orientation in this world. Second: We ought to keep in mind that all interpretation of the social world has to start from the actor’s subjective point of view. Therefore, we cannot accept the term, “unit act”, as such, without trying to reduce it to its subjective meaning. Here I have to discuss in general terms why I insist on the subjective point of view. This is more than the whim of a few social scientists; social science cannot be built up except by taking cognizance of the subjective meaning the actor connects with his acting. Finally, I have to discuss the fact that there are social sciences operating on high theoretical levels that, like economics, apparently prefer to deal with statistical curves and mathematical formulae rather than with actions of human beings in the social world, yet they use the term, “rational action”, as an indispensable element of their systems. I will have to show what modification this term undergoes in these types of social sciences..). (shrink)