GEODECO applies probabilistic techniques coupled with non-linear dynamic analyses of structures subject to multiple real ground motion recordings to assess the structural damage at multiple levels of ground shaking (PSDA). For this purpose, GEODECO has an extensive ground motion database which includes thousands of seismograms recorded around the world. For structural modelling we use a widely tested, internationally recognized finite element software with an extended element library. This probabilistic procedure allows us to assess the structural performance, the compliance with seismic code requirements, the quantification of safety margins, and, if appropriate, the identification of the most cost-effective requalification solutions.