Although globalisation's impact on national economies is well recognised, little quantitative information is available to shed light on the issues involved in debates on the subject. The purpose of this manual is not to evaluate the many consequences of globalisation, but rather to measure its extent and intensity. The manual defines the concepts and puts forward guidelines for data collection and the fine-tuning of globalisation indicators. The proposed indicators apply by and large to multinational firms -- the major players in the process of globalisation -- particularly in the areas of trade, international investment and technology transfer. ALSO AVAILABLE ON CD-ROM AND ONLINE: the database Measuring Globalisation is also available on sourceOECD and on CD-Rom in user-friendly software, Beyond 20/20TM for WindowsTM, that allows users to extract and export data, prepare customised graphs and tables, and perform their own analysis.