International Recommendations for Tourism Statistics 2008 Compilation Guide is a companion document to the International Recommendations for Tourism Statistics (IRTS 2008). The primary purpose of this Compilation Guide is to provide further clarifications and practical guidance for using sources and methods to compile statistics on tourism. It is designed to support the production of a high quality set of basic data and indicators in each country, and to strengthen the international comparability of tourism statistics. The Compilation Guide was prepared by national compilers of tourism statistics, experts from international and regional organisations, and by staff of UNWTO.