Information is nowadays considered an essential resource for the survival and development of organizations. The advent of new information and communication technologies made possible to offer an enormous amount of data for directors, managers and business executives´ use in a scale never imagined a few decades ago. Nevertheless, the effective use of information cover several aspects which not only depend on quantity or technology, but also on factors that allow to capitalize its value, improving decision quality in the organizations. This work searches to know better the existing relation between the organizational processes of information management and its influence on decision-making of a large Brazilian public organization, the Social Security. In this way, theoretical concepts about information management spread by Marchand, Davenport and Checkland were used. The research was executed through documental analysis, participant observation and semi-structured interviews, all used to collect perceptions and behavior related to decision-making of several executives of the three institutions that make up the organization. The analysis of the results reveals aspects which may bring about a better understanding of business and information problems experienced by the studied organization, as well as pointing out alternatives to turn its information processes more effective, in order to aim at quality services increase granted to Brazilian population.