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The Headmasters' and Headmistresses' Conference (HMC) represents the Heads of some 250 leading independent schools in the United Kingdom and the Republic of Ireland. HMC has a further 60 or so international members, up to 30 additional members (Heads of maintained schools in the UK), and 34 Honorary Associate Members (retired members).


The International Baccalaureate Organisation (IBO) is a recognised leader in the field of international education, encouraging students to be active learners, well-rounded individuals and engaged world citizens. Founded in 1968, they currently work with 1,920 schools in 124 countries to develop and offer three challenging programmes to more than 501,000 students aged 3 to 19 years.).


The Association of IB World Schools in Italy (AIBWSI) exists to support member schools in achieving their common educational goals and to provide representation on topics of common interest. St George’s is proud to be among the Association’s founding members.


COBIS (formerly COBISEC) was founded in 1981 as the Council of British Independent Schools and is a Charitable Association registered in The Hague. The Association is managed by an elected Executive Committee, which includes both Heads and Board Members. In 2000 the Association became affiliated to ISC. The Secretariat in the UK provides services to Members and Affiliate Members and is a reliable source of information for parents looking for schools abroad.


 As an international school membership organisation, the European Council of International Schools provides services to support professional development, curriculum and instruction, leadership and good governance in international schools located in Europe and around the world. ECIS creates opportunities for education and dialogue, encourages alliances with other organisations, and acts as a catalyst for the advancement of international education. ECIS schools are committed to the promotion of an international outlook amongst all members of their communities. Their staff and students are characterised by knowledge of, and respect for, the beliefs and values of their own and other cultures and by the willingness to acknowledge the existence and necessity of a range of perspectives. ECIS members and affiliate members serve and support member schools through an ongoing process of professional renewal characterised and facilitated by networking, research, sharing and collegiality.

The Association of Governing Bodies of Independent Schools supports and advises governing bodies of schools in the independent sector on all aspects of governance, under the umbrella of the Independent Schools Council.


The Council of International Schools (CIS) is a not-for-profit association of schools and post-secondary institutions working collaboratively for the continuous improvement of international education.