The Best Poster Award was awarded for the contribution Comparison of implicit and explicit uncertainty analyses in the design of a WWTP upgrade (K. Cierkens, E. Belia, L. Benedetti, S. Weijers, T. Flameling, B. De Baets and I. Nopens) at Watermatex 2011, the 8th IWA Symposium on Systems Analysis and Integrated Assessment (San Sebastián, Spain, Jun 2011).