WCRP/IOC Workshop on Regional Sea-Level Change; Paris, France, 7–9 February 2011. A joint World Climate Research Programme (WCRP)/Intergovernmental Oceanographic Commission (IOC) workshop was held to discuss regional changes of sea level. The workshop was attended by 41 experts from the world over who compared observed regional sea level changes with those inferred from numerical simulations and compared future predictions and their analyses in terms of processes. Satellite altimetry observations continue to be essential in revealing that sea level is changing prominently on a regional scale. However, existing climate models are largely in disagreement about patterns and magnitudes of observed sea level variability, and it is unclear how accurate they may be in predicting regional sea level.