In the general frame of CAENTI after two years of WP4T work an active partnership has started between social actors of the Belgian association of Optim@, that is working in Seraing, and the French research team of OER, that works about rural school. On the suggestion of Optim@, the two partners have answered positively to the request of territorial diagnosis which have expressed the local actors and political deciders of the wallon city of Chapelle-lez-Harlaimont... With the aid of the French research laboratory MTI (ThéMA) the two partners are actually from March 2008 developing a collective participating approach that uses the digital tools (CATALYSE) of the territorial intelligence (Bertacchini, 2004; Dumas, 2004; Girardot, 2004, 2007) for increasing the local sustainable development (Bruntland, 1987) of the industrial city of Chapelle-lez-Herlaimont. As participating observers the two authors study the project of territorial diagnosis and the participating approach. The authors analyse first the organization of the three partners (OER, Optima@ and MTI), the participating approach of co-construction (Legardez, 2007) of the territorial knowledges, the calendar of the operations and, if possible, the first qualitative and quantitative results. They examine the level of pertinence and efficiency of the applied research for the local sustainable development of Chapelle-lez-Herlaimont. They measure the weight of the explicative variable that comes from territory and especially the eventual weight of territorial effects (Bidou- Zacchariasen, 1997; Champollion, 2005, 2007). They begin to evaluate the process of territorial intelligence that is developed in this operation.