EN
International synchronisation of business cycles is an important research area of contemporary open economy macroeconomics, and thus a major focus of the literature on the economics of international rela¬tions. Since the issue is very wide, a number of complex and advanced methods can be applied to analyse it, which has given rise to a broad debate on relevant methodology. The aim of the paper is to overview the key methodological aspects and problems of the modern empir¬ical studies on international synchronisation of business cycles. The author focuses on the following analyti¬cal problems: methods most commonly used in detecting the business cycle synchronisation (convergence), methods of detrending (filtration) in time-series analysis, and the type of data used (panel data studies).The presentation of methodology is illustrated by selected examples of their use in empirical studies in the Polish and foreign literature.