Western science rests on procedures reductive of diversity in particular because it takes into account only linear causality. This reduction is all the more fundamental since its aim is generalisation and mathematisation. The consequence for social sciences and humanities are the loss or the reduction of spatio-temporal references, the elimination of reference to the subject and historical and evolutionary characteristic of scientific knowledge. Today the planetarisation of exchanges forces social sciences and humanities specialists to reconsider their processing and management of human diversity.