Teachers make up one of the largest single occupational groups in the economy, but they are divided between six trade unions organising teachers in state schools in England and Wales; the National Union of Teachers (NUT), the National Association of Schoolmasters and Union of Women Teachers (NASUWT), the Association of Teachers and Lecturers (ATL—formerly the Assistant Masters and Mistresses Association, AMMA), the National Association of Head Teachers (NAHT), the Secondary Heads Association (SHA) and the Professional Association of Teachers (PAT). The Educational Institute of Scotland (EIS) is the main union for teachers in Scotland’s different state education sector.