A workshop was held from 14 to 18 February 2011 in Hradec Králové, Czech Republic, bringing together Dobson total ozone data managers and experts from the central facilities of the WMO Global Atmosphere Watch programme to discuss how to re-evaluate and reprocess some important past data sets. The workshop was organized by the Czech Hydrometeorological Institute and the Scientific Advisory Group on Ozone of the Global Atmosphere Watch provided expert guidance. The main goals of the workshop were to bring together managers of the archive data sets from the Dobson stations and provide guidance on how to reevaluate and reprocess important past data; to collect the primary (0-level) Dobson data sets and calibration metadata from the stations to be archived in the World Ozone and Ultraviolet Radiation Data Centre; and to present themes and actual results in terms of the operation of the Dobson instruments and data quality assurance at the stations. The workshop was attended by 34 participants, including 21 station data managers of 51 Dobson stations representing some 70 per cent of the currently active Dobson stations. A unified template of the information held by the individual stations was developed for circulation to all stations in the network. The participants learned about problems with the earlier data, and methods of reprocessing data using the freeware developed by the regional Dobson calibration centres.