This article presents a framework oriented to guide the methodological construction of the decision-making process model of an organization, and the subsequent derivation of a requirements model for the development of Data Mining projects. The decisional model, is defined as a conceptual tool made up of a set of related concepts which represent the decision-making processes of an organization. The importance of a decision-making model is that with a clear definition of the requirements which arise from the organization's goals and which generate the decisional processes: the development is permitted of a Data Mining project which is effectively aligned with the achievement of the organization strategic goals.