ICAO Doc 9835 is Manual on the Implementation of ICAO Language Proficiency Requirements created by ICAO. This document serves as certification basis for implementation of ICAO English. Document establishes the rules and procedures required for Testing Service Providers as well as the procedures for ICAO English testing. Document has introduced language proficiency rating scale which has been later on adopted by EASA as well.
Download ICAO Doc 9835 - Manual on the Implementation of ICAO Language Proficiency Requirements