The IOE has had a major impact on the field of geography education, under the leadership of David Lambert. His ideas on the subject's structure, content and significance, developed in part with John Morgan, have been put into practice, most powerfully through the £4m government-funded Action Plan for Geography 2006-11 (APG), which boosted teacher knowledge and raised geography's profile. As a result of the APG, and his influence on the Geography Association's 2009 `manifesto', Lambert's work has benefited more than two-thirds of English secondary schools. His ideas have influenced national curriculum developments, GCSE course revisions, the thinking of Ofsted and have been carried around the world.