This report, which is based primarily on figures released by the Organisation for Economic Cooperation and Development (OECD), reviews the indicators available for international comparisons of vocational education and training (VET) to clarify the following issues: the kinds of comparability problems that exit, their extent and severity, their causes, and possible ways of correcting them. Chapter 1 provides an overview of existing international comparative studies of VET. Chapter 2 looks at the data sets currently used by the OECD in international comparisons of VET. Chapters 3-5, which are devoted to the problems associated with use of the data sets, address the following topics: problems of comparison (definitions, comparisons in practice, case studies in comparative analysis); defining the "average" country (problems and concerns in determining the "average," theoretical considerations, absolute and comparative advantage); and lessons from existing methods (problems of scope or coverage, categorization, and measurement when collection data). Chapters 6-7, which consider arguments for making meaningful comparisons of VET and place particular emphasis on the Australian perspective, emphasize the need to take the uniqueness of countries' economies into account when comparing their VET systems and offer recommendations regarding putting theory into practice. Chapter 8 reviews the report's findings. (Contains 33 references.) (MN)