The present study involves the assessment of agricultural sustainability of the South Milan Agricultural Park (Parco Agricolo Sud Milano, PASM). The project aims at the creation of a decision support tool for the management of the region in order to improve the economic performances of the agricultural activities and, at the same time, to guarantee the safeguard of the environment and the social context. The first two phases of work involved the collection of the useful information for the construction of the model, named 4Agro, with the aim to reach a practical application for the achievement of the objectives described above. The third year of work has the main objective to make available 4Agro to the farms of PASM through its implementation in an online software. Its features will allow to be technically stable but also dynamic from a methodological point of view, in order to be easily renewed according to innovations and regulations of the agricultural sector and, even more, with those of the PASM.