CEFR
The Common European Framework of Reference or CEFR was published in2001 in English1 and French after a period of development from 1992 to 1996 and piloting from 1997–2000, has been translated into 40 languages and is now accepted as the international standard for language teaching and learning. The CEFR has two main aims: to encourage reflection by users over the way their current practice meets the real world language needs of their learners and to provide a set of defined common reference levels (A1-C2) as points of reference to facilitate communication and comparisons.
The EOI curriculum uses the CEFR as a benchmark. You can have a look at this brochure with specific examples of language according to each level: CEFR CORE INVENTORY FOR GENERAL ENGLISH – BRITISH COUNCIL