Structure in textbook file makes it easier for screen readers and other assistive technologies to read and navigate a document. The following Accessibility Levels are provided by ATI based on quality of files provided by the publishers, individual scanned materials and individual accessibility needs.
AL1 – Accessibility Level 1
- Automated
- Auto Tags
- OCR (Optical Character Recognition)
AL2 – Accessibility Level 2
- Manual: Includes all of Level 1 plus:
- Chapter Headings + Additional Heading levels as necessary
- Linked Table of Contents
- Bookmarks
AL3 – Accessibility Level 3
- Manual: Includes all of Levels 1 and 2 plus:
- Alternative text for all meaningful images
- Structured tables