How do you define accessibility requirements for a system?

Question

Accepted Answer

**Accessibility** — ensuring systems are usable by people with disabilities.

**Standards:**
- **WCAG 2.1 AA:** Minimum compliance level.
- **Section 508:** US federal requirements.
- **ADA:** Americans with Disabilities Act.

**WCAG principles (POUR):**
- **Perceivable:** Content available to all senses.
  - Alt text for images, captions for video.
  - Sufficient color contrast (4.5:1 ratio).

- **Operable:** All functionality available via keyboard.
  - No keyboard traps.
  - Skip navigation links.

- **Understandable:** Clear and predictable.
  - Consistent navigation.
  - Error identification and suggestions.

- **Robust:** Compatible with assistive technologies.
  - Semantic HTML.
  - ARIA attributes when needed.

**Testing tools:**
- axe-core, Lighthouse, WAVE.
- Screen readers: NVDA, VoiceOver.

**In requirements:**
- Include acceptance criteria for accessibility.
- Budget for manual testing with assistive tech.

Systems Analyst: How do you define accessibility requirements for a system?