Trondheim International School is open to all applicants. Applications which are received within the application deadline are considered first if there are more applicants than available spots in the class. Applicants are prioritized without exception according to the set of admission criteria in this strict order below

1. Students moving up from ThIS preschool
2. Siblings of students at ThIS or ThIS preschool
3. Student who has attended a school that delivers the IB curriculum for one year or more
4. Student with English as a native, spoken language
5. Bilingual/multilingual student
6. Children of staff
7. Lottery