In order to deal with the corporate environment’s high degree of dynamism, complexity and uncertainty, organizations develop planning processes based on prospective approach, incorporating into the strategic discussion a plural reflection on the future. However, in corporate practice it is not usual to make extensive use of complex studies of scenarios when formulating the firm’s strategies and defining its commitments. This is due to the decision-making difficulties encountered by managers when confronted with these processes’ diverse possibilities and the distance that exists between scenario construction and strategy formulation. In order to enhance the interaction between strategy formulation and prospective approach, this thesis proposes an Integrative Model for multiple strategies formulation, grounded on solid theoretical foundations in the areas of strategic foresight, strategy and organizational learning, which was developed following the methodology of action- research and applied on the corporate planning process of Sistema Eletrobras, a business group in Brazil’s electricity sector. The Model seeks to consolidate a multiple strategy formulation process, enriched by support from scenarios, and constitutes an important instrument for the management of uncertainty in decision-making.