Harrow International School is organised into three sections: Primary , Preparatory and Secondary which together share the Don Muang campus. The age range of children attending the school is from 18 months in the Little Lions Parent and Toddler Group to 18+ years in Year 13, when students graduate from the school. Each section of the school has its own Head who is supported by middle management teams, class teachers/tutors and specialist staff. He or she is responsible to the Head Master while retaining considerable autonom