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The Common European Framework of Reference for Languages (CEFR) is one of the best known publications from the Council of Europe throughout the world (Byram and Parmenter 2012). It is known to the many kinds of readership for which it was designed: language teachers, assessment specialists, policy makers, inspectors, teacher educators and others including, not least, language learners. The latter are perhaps not aware of the publication but they do know about different levels and can describe their competence as A1 or B2 etc.
Michael Byram (Fri,) studied this question.