The Common European Framework of Reference (CEFR) levels:
- A — Basic User
- A1 — Breakthrough or beginner
- A2 — Way stage or elementary
- B — Independent User
- B1 — Threshold or intermediate
- B2 — Vantage or upper intermediate
- C — Proficient User
- C1 — Effective operational proficiency or advanced
- C2 — Mastery or proficiency