What is Assistive Technology (AT)? Assistive Technology is defined by the Individuals with Disabilities Education Act (IDEA) as any 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. The term does not include a medical device that is surgically implanted, or the replacement of such device.