The Longitudinal Surveys of Australian Youth (LSAY) is a research program that tracks young people as they move from school into further study, work and other destinations. This "User guide" has been developed for users of the LSAY data. The guide endeavours to consolidate existing technical documentation and other relevant information into a single document, thereby improving data accessibility and promoting wider use of the LSAY data. To promote effective use of the data, the guide aims to address all aspects of LSAY data, including information about: how to access the data, data restrictions, variable naming conventions, the structure of the data (using topic areas, topic maps and data elements), classifications and code frames used, weights and derived variables. This guide and its supporting documents can be found at http://www.ncver.edu.au/publications/2225.html. (Contains 24 tables, 9 figures, and 10 footnotes.)