Practical Plans for Accessible Architectures
Accessible design requires a deeper understanding of context. It's about providing alternative routes to information, whether that route is a different sense (seeing or hearing), a different mode, (using a tab key or a mouse), or a different journey (using an A to Z site index instead of main navigation). However, accessibility is much easier to achieve when the right foundations are put in place as prerequisites during site planning and strategy.
Forman, Frances. Boxes and Arrows (2007). Design>Web Design>Accessibility