Abstract
In this article some basic aspects of international comparisons are discussed. Particular comparison projects will only be referred to by way of example. The objective is to clarify some general problems of the vast area of statistical activity called international comparisons. This activity has been growing rapidly during the last three decades, involving more and more countries, and new areas, by developing and refining the methods. International statistical recommendations in various fields acted as prerequisites for numerical excercises. It is time to make an attempt of systematization, primarily for the sake of better orientation in the various methods.
The discussion is confined to international comparisons of macro economic categories and closely related areas. Projects like conversion keys between various classification systems and similar activities are excluded from consideration here.
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