This report focuses on the observations and opinions of the principals whose schools are currently providing NBSS Level 3 support to students through a NBSS Behaviour for Learning Programme. See ‘NBSS Level 3 Support: The Students’ Voice’ and ‘NBSS Level 3 Support: The Behaviour Support Teachers’ Views’ reports that explore the experiences of the teachers who provide NBSS Level 3 support and the views of the students who have received this support.