"The study of appropriation of space supposes a consensus on definitions. Here, the psychosociological appropriation of built space is considered in relation to the socio-economic conditions of physical appropriation. - Three preliminary remarks are necessary : on the importance of the contra dictions related to the environment in the industrial civilization, on the loss of bearings, on the rapidity of the transformations. 2 - The psychosociological processes operating in appropriation are related to practises, perception, images, representations, desires, aesthetic feelings, the imaginary, aspirations, plsns.Oetween the objects arranged in the daily space and the subject who tends to appropriate this space, complex dialectical relationships are established. 3 - Examples are taken from the housing-space, during meal-rime, in the neigh bourhood space in the production space. This last example is based on a survey made by workers themselves, that shows the processes of "desappropriation" of space. The link between work-space, housing-space and neighbourhood-space is emphasized. 4 - The processes of appropriation can be studied only in relation to the proces ses of technological transformation and social transformation, the one not neces sarily leading to the other. The inequality in the possibilities of appropria tion is underscored. Within the lodging, new objects, television in particular, modify both the social relationships and the modes of appropriation. 5 - Is the appropriation of space by all possible ? To ask this question is to open a discussion on the establishment of a genuine democracy."