What this model proposes is a methodology of analysis and a formula to cal- culate the final value. The methodology is based on several leading principles: • Involve stakeholders to understand their expectations, perceptions and needs and be sure that the provided information on impact evaluation is actually relevant for them.• Measure both the positive and negative effects that can arise from a certain intervention.• Measure both internal and external impacts such as corporate culture, employee satisfaction or environmental waste, and according to them identify an order of priorities on how to proceed both in the short and long term.• Include only those impacts that can be realistically attributed to the organization/ project, as several actors and external conditions can have a role in determining the pursued change.• Do not overstate impacts, and do not include the same indicator in both the social and financial evaluations.• Describe what makes a project better than existing ones, basing the evaluation process on a comparison between the social performance and the next best alternative, focusing not merely on the created benefit for society but also on the increased social impact compared to the activities of others.• Quantify and monetize impact where possible, as not all the impacts can be accurately and significantly monetized, and misusing monetization can lead to wrong and too-subjective information.• Consider the risk factors that could hamper the implementation of the model.• Monitor results regularly, to understand any discrepancy and evaluate any improvement.