In Flanders, Seveso-establishments are obliged to perform a Quantitative Risk Analysis (QRA) in the Safety Reports. The QRA is performed by external experts who are free to choose the software to do these calculations. A few years ago, Flanders determined that the outcome of a risk calculation depends very much on the external expert who does the calculations and on the software used. Therefore, Flanders started the Project Unification to reduce the differences between experts and software. The result of the Project Unification is a new manual for risk calculations. This manual contains all major steps necessary for the calculation of the risk of an establishment. The manual is published in April 2017.