DE102 supports operators in the drafting of Energy Diagnosis for as required by art. 8 of Legislative Decree no. 102/14 (European Directive 2012/27/EU on energy efficiency). The Software is able to provide, in a simple and intuitive way, a thorough knowledge of the energy consumption profile of entities, subjected to Diagnosis and, thanks to the Decision Support System, suggests a wide range of improvement interventions achievable to reduce the energy cost. The Software is a cloud tool, based on a user-friendly interface, viewable even from smartphones and tablets, which guides the operator in the generation of energy audit reports and the insertion of the essential elements in the different sections.