Urban practices analysis : practical and theoretical knowledges . -Socio-spatial practices have three main axis, which are easy to identify : neighbourhood, district, urban center. It is possible to reveal the structure of the city as a lived space in marking poles of elementary social life and barrier effects, the size inequality of everybody's appropriated areas is the main phenomenon. Size inequality reveals a complex hierarchy in which cultural factors are important but socio-economic ones are the main element. Many people, who have been interviewed, wished to be informed of the results. The paper's author has prompted associations and inhabitants to do researches about their everyday life.