Faculty at International Schools are usually from or certified by the standards of their country of origin. However there are many exceptions. The most common exception is when the international school requires a teacher trained specifically for an international syllabus or for teaching a foreign language rare to the international school's country of origin.
Hiring is frequently done at large international job fairs, such as the ones held by the Council of International Schools (CIS), where schools can interview and hire several teachers at once. There are also a handful of agencies which specialise in recruiting international teachers. Over the years it has become harder to recruit young international teachers, partly because of international security fears, partly because the compensation packages are not as attractive as they used to be. In some countries such as South Korea, recent visa changes have also made it more difficult to obtain both qualified and unqualified teachers.