The study of tools from four Late Neolithic sites of Deûle valley (Nord-Pas-de-Calais) is addressed in order to identify the “chaînes opératoires” implemented since the acquisition of raw materials to processing and / or consumption through the various stages of processing materials involved. Combination of paleo-environmental data with results of technological and functional analysis conducted on stone, animal materials or clay tools allows to define some of the activities on these sites and to discuss concept of tools interactivity. According to preliminary results, exploitation of plant resources appears to be of particular importance in this context.