An additional support need comes from anything which is a barrier to learning. Most, or all, schools will have some children with additional support needs of some kind. The education authority has many legal duties towards pupils with additional support needs.
Information about this is contained in a booklet called In On The Act : Information For The General Public which is published on the education authority website at www.edinburgh.gov.uk/inontheact or contact the additional support for learning team on telephone number 0131 469 3444.
This link takes you to a film for parents with children with additional support needs designed to help you navigate your way through the services available to support your child.
Parents Guide to additional support for learning