Language textbooks and linguistic training materials in the European Union are based on the Common European Framework of Reference for Languages (CEF).
The GER/CEF is a framework for defining linguistic capabilities which enables the most precise possible classification of your own abilities., and also helps to tailor services in the languages sector more acurately to the individual's needs.
The CEF levels of competence serve to define the individual's basic level of grammar and vocabulary. It makes textbooks easier to compare. It also enables the level of learning of different groups to be described clearly and in a universally understood way. The standards apply across languages, and are an indication of a language student's capabilities.
The Common European Framework of Reference differentiates between levels of competence, each of which is often sub-divided into a more precise definition.