Successive World Conferences of TPOs have sought to debate, identify, and document "best practice" for TPOs. Delegates at the Fourth World Conference of TPOs in Beijing, in May 2002, thought that we should have a mechanism for a frequent exchange of best practice information. Since then, ITC has invited TPOs around the world to contribute their best practice examples. The response has been very encouraging: some 38 TPOs responded and 42 best practices were selected from 22 TPOs for this publication.