The course investigates the phenomenon of revolutions from the point of view of political psychology: of the branch of social psychology which focuses on the psychological mechanisms associated to political practices. After an introduction to the general proceedings and methods of political and social psychology, the course will explore the psychological mechanisms that underpin the stability of political regimes and which, under certain conditions produce phenomena of “stasis” and violent constitutional change. These mechanisms constitute the subjective reception of those structural social disfunctions which lead to the growth of collective expectations which cannot be met and the frustration of which is provoking discontent. The psychic factor is analyzed into the desirability of the possibilities of “exit”, of “voice” and “loyalty”, with revolution being the choice of “exit” when “loyalty” recedes under the weight of growing anomy. The establishment of a new political order is examined through the prism of the psychological need of “routinization”.