The Consulting Arborist Society was formed in 2003 from the Arboricultural Mortgage Insurance Users Group (AMIUG) as a vehicle by which consultants accredited to this could promote their services. Since then, it has expanded to recognise eight Areas of Professional Competency. We recognise that whilst some consultants provide a comprehensive service covering all disciplines within arboriculture, many choose to specialise within a smaller field. Some are developing their skills and are working to become accredited within the wider field. This means that some consultants offer skills not yet accredited by CAS.