Non-serving shortlisted candidates may be subject to formal tests on essential and/or desirable proficiencies in NATO’s official languages, i.e. English and French (only in non-mother-tongue). Rarely, candidates will also be tested in the host nation language.
Level 1 Elementary
Level 2 Fair (limited working)
Level 3 Good (minimum professional)
Level 4 Very Good (full professional)
Level 5 Excellent (native speaker/bilingual)