The first Manual on Statistics of International Trade in Services (MSITS 2002) was prepared by the Interagency Task Force on Statistics of International Trade in Services (TFSITS). It was approved by the UN Statistical Commission at its thirty-second session in March 2001 and was
officially published in 2002. The MSITS sets out a statistical framework for the collection and dissemination
of trade in services data.
The manual is available for download here.