Recoge: 1. Introduction - 2. Quality of Statistics: A multidimensional Concept - 3. Data Available and Reliability Indicators - 4.Comparing The Reliability of Deficit Data among Different Countries - 5. Inferring Future Revisions - 6.Comparing deficit and debt revisions - 7. Evolution of reliability over time -8.Comparing size of revisions and size of deficit - 9. Conclusions.