The CEFR Scale
Common European Framework of Reference
The Common European Framework of Reference for Languages (CEFR) is an international standard or guideline to describe achievements of learners of foreign language in an international comparable manner.
It describes what language learners can do at different stages of their learning.
The CEFR was put together by the Council of Europe to be used in Europe, but since its publication in 2001, the CEFR has been translated into 37 languages and its use has spread outside Europe, from Asia to Latin America, as an aid to defining levels for learning, teaching and assessment of foreign languages.
Source: Council of Europe Portal