The EUROCADET project has developed PREVENT: a computer programme to build scenarios where the impact of cancer prevention interventions can be modelled. A workshop was convened for 15 researchers and data analysts from cancer registries and public health observatories. The workshop was led by Dr Valery Lemmens, Dr Isabelle Soerjomataram and Professor Jan Willem Coebergh from the Eindhoven Cancer Registry and from Erasmus University in Rotterdam. Further information on EUROCADET and PREVENT on www.eurocadet.org.