This multilingual ""Thesaurus on Tourism and Leisure Activities"" is the fruit of over 20 years work seeking to develop a specific documentation language to help search for information relating to tourism activities. It can be used as a guide to tourism terminology, as well as for the standardization and normalization of a common indexation and research language, at an international level. Terms very specific to tourism have been extensively defined so that individuals unfamiliar with this vocabulary can also use the Thesaurus.