Why International School of Tucson? The IST mission identifies character development such as self-confidence, integrity, communication, and personal goal setting which necessitates developing a well-rounded student who is capable of global integration and success. The understanding, learning, and application of these characteristics are delivered through curricular and extracurricular activities. IST believes that early language immersion in a second language promotes better cognitive abilities, supports multiculturalism and acceptance of others for a better future together.