A commercial pilot, especially in the airline industry, is in a role that is essentially the same as that of a pilot who is employed and was trained in just about any other part of the world.
Does this also hold for air traffic controllers? How similar will the training and practices and the systems that they use in their work be?
Are qualifications obtained in one country or region recognised in others?
How much additional training would be required for a controller who has trained and worked in one European Union country, in order to take a similar role in another? Or in a non-EU state?
Would the hardware and software used by a controller in one country be familiar to a controller from another?