The document discusses the Australian Professional Standard for Principals established by the Australian Institute for Teaching and School Leadership (AITSL). AITSL's mission is to promote excellence in teaching and school leadership for the benefit of Australian students. The Professional Standard for Principals defines the key leadership requirements of principals under five domains: vision and values, knowledge and understanding, personal qualities and relationships, professional practice, and engagement and achievement. It provides a common language for leadership and guides principals' professional learning and development.