Useful references

ICAO Doc. 9835 Manual on the Implementation of ICAO Language Proficiency Requirements
(First Edition September 2004)

ICAO Doc. AUD001 ICAO Language Proficiency Requirements – Rated Speech Samples
(Version 1.2 ICAO 2007)

ICAO Cir 318-AN/180 Language Testing Criteria for Global Harmonisation
(July 2008)

ICAO Language Proficiency Requirements – Frequently Asked Questions (FAQs)

ICAO Implementation Guidelines for aviation language requirements

Directive 2006/23/EC of the European Parliament of April 2006 on a European Community air traffic controller licence.

Association of Language Testers in Europe (ALTE)

ALTE Code of Practice

Glossary of English for Aviation Language Testing Terms

ICAO Annex 1 — Personnel Licensing; Annex 6 — Operation of Aircraft, Part I and Part III; Annex 10 -- Aeronautical Telecommunications, Volume II — Communication Procedures including those with PANS status; and Annex 11 — Air Traffic Services