The second session of the Criteria Expert Group (CEG-2) for persistent organic pollutants (POPs) met from 14-18 June 1999 at the Vienna International Center. Approximately 140 participants representing 60 countries attended the meeting to build upon the work of CEG-1 in the development of scientific criteria and a procedural process for adding other POPs to the initial list of 12 identified for global action. In the warm climes and high culture of host city, Vienna, delegates to CEG-2 found the inspiration they needed to undertake their work in what was by and large a harmonious and well-orchestrated performance. The CEG succeeded in completing its work in two rather than three sessions, well ahead of its deadline, as agreement was quickly reached on many key issues. The final report will be forwarded to the third session of the Intergovernmental Negotiating Committee for an International Legally Binding Instrument for Implementing International Action on Certain Persistent Organic Pollutants (INC-3), which will meet from 6-11 September 1999 in Geneva.