The search for competitiveness has led organizations to show an increasing concern with social responsibility (SR). However, there are still problems relating to information on which social actions, in the case of the concern with SR, most contribute to achieving its objectives. In view of the above, this article was designed with the aim of demonstrating how to evaluate the performance of social investments of companies, more specifically, in the internal public - one of the dimensions of the concept of SR -, considering its objectives and its concern with SR in this area of investment. It proposes a theoretical -methodological perspective, based on the Methodology of Constructive Multi-criteria Decision Aid, which is capable of modeling the investors' perceptions and providing guidance for the decision-making process. Initially, three models are presented for evaluating organizational performance in the internal public, which incorporate the SR, and are widely recognized and largely used. It should be noted, however, that they contain generic indicators and do not meet the stated objective (since this is not their purpose). Therefore, a tool is required which is capable of doing this. Next, by means of a case study, the practical implementation of this proposed tool is demonstrated, for the restricted case of investments in internal public. At the end, some final considerations are given.