The paper examines the possibility to manage through the Geographical Information Systems a participatory and collaborative approach to Regional Planning environmentally oriented. The purpose is to integrate expert and non-expert knowledge at the local level. A GIS has been presented in a particular way based on common sense knowledge that a new instrument is helpful for planning and is able to manage the new emerging paradigm of the complexity, especially in the environmental field, a domain still to explore fully. This system has double contents: on the one hand it is functional for decision-making, and on the other it contributes to give a local vision of the analysed territory. it is represented in a way that is different from the consolidated models with prevalent technical and scientific character. The territorial contest referred to is the town of Ruvo of Puglia, situated in a wider zone -Alta Murgia (Apulia, Italy).