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From SKYbrary Wiki
The 'Personnel Licensing' category within SKYbrary contains articles related to licensing of all personnel undertaking safety related tasks in civil aviation (pilots, air traffic controllers, aircraft maintenance engineers, etc.)
Nowadays, the overarching framework for licensing of all personnel is provided by Annex 1 “Personnel Licensing” to the Convention on International Civil Aviation, known as The Chicago Convention.
The full article can be read here.