The most important criterion to be able to participate in the INSO is to win the Nuclear Science Olympiad in your country/region (National Nuclear Science Olympiad, NNSO). Each INSO member country/region can send up to four students. There are some other restrictions:
You cannot register for participation with the INSO directly. Please talk with your high school teacher, look at the website of your national/regional competition, or contact your national INSO coordinator.