Assistive Technology: What Is It?
http://www.alltech-tsi.org/resources_a/publications/articles/at.htm

ALLTech
2004

Abstract:

The term 'assistive technology device' means any item, piece of equipment, or product system, whether acquired commercially off the shelf, modified, or customized, that is used to increase, maintain, or improve the functional capabilities of a child with a disability.