This paper addresses the question of a technical change in one the components of the Stability and Grown Pact (SGP). Indeed, the SGP is composed of (1) a political commitment, (2) a preventive element, and (3) a dissuasive element, and an improvement of the SGP efficacy can come from any of these three components. In this paper the author proposes a new early warning procedure, part of the preventive element. The ideal situation would be for the European Commission to be able to identify countries at risk as soon as they vote their national budgets. Although this is not possible, as the measures of the deficit are based on GDP forecasts, the conclusion this paper makes is that the EC should avoid relying on GDP forecasts by calculating a reference index.