EGU General Assembly 2013, Vienna.  Leonard Smith presented a short course: ‘Predictability in Theory and Predictability in Practice’. Ewelina Sienkiewicz presented a poster by A.S. Jarman and L.A. Smith. Nick Watkins gave four presentations. Nick Watkins and David Stainforth co-authored two presentations given by Sandra Chapman. Abstracts. See CATS at EGU 2013.