Accessibility Study Guide

📖 Core Concepts Accessibility – Designing products, services, or environments so people with disabilities can use them directly (without help) or indirectly (via assistive tech). Usability vs. Accessibility – Usability = how well any user can achieve a goal; accessibility = removing specific barriers for disabled users. Universal Design – Creates solutions usable by the widest possible audience. Accessible Design – Specifically targets and eliminates barriers for people with disabilities. Assistive Technology – New devices that enable a task that would otherwise be impossible (e.g., screen‑reader software). Adaptive Technology – Modifies existing devices or repurposes them for accessibility (e.g., remote‑control appliances for limited mobility). WCAG Conformance Levels – A (basic), AA (mid‑range), AAA (highest) compliance with the Web Content Accessibility Guidelines. 📌 Must Remember UN CRPD Article 9 obliges signatories to provide full accessibility in public spaces, transport, buildings, and services. ADA (1990, US) – New construction must be accessible; renovations must improve accessibility proportionally to cost. Section 508 (Rehab Act) – Federal agencies must make electronic & information technology accessible; WCAG is the technical reference. European Accessibility Act (enforced Jun 2025) – Sets common accessibility standards for products, services, and public buildings in the EU. WCAG Levels – A < AA < AAA; most regulations require at least AA. Visitability – Zero‑step entrances & ≥ 32‑inch doorways for wheelchair access in new homes. TAMI & ARM – Core tools for evaluating test accessibility; they embed universal‑design and cognitive‑load principles. 🔄 Key Processes Perform an Accessibility Audit Identify barriers → Map to WCAG criteria → Use automated tools → Conduct manual verification → Document findings & remediation plan. Select Assistive vs. Adaptive Tech for a User Assess the task → Determine if existing device can be modified (adaptive) → If not, procure new device (assistive) → Train user & evaluate effectiveness. Implement WCAG‑AA on a Website Ensure perceivable (text alternatives, contrast), operable (keyboard navigation), understandable (clear language), robust (semantic HTML). Design a Universal‑Design Home Zero‑step entry → Wide doorways → Lever‑type hardware → Reachable storage → Adjustable‑height countertops → Install level‑floor shower. 🔍 Key Comparisons Assistive vs. Adaptive Technology Assistive: brand‑new device created for a disability (e.g., screen‑reader). Adaptive: modifies an existing device to become usable (e.g., remote control for limited mobility). Universal Design vs. Accessible Design Universal: aims for the broadest possible audience, including nondisabled users. Accessible: focuses specifically on removing barriers for disabled users. WCAG Conformance A vs. AA vs. AAA A: Minimum; meets basic accessibility (e.g., alt text). AA: Adds contrast ratios, resize‑text, and more robust navigation (most legal requirements). AAA: Highest; includes extended captions, sign language, and advanced readability. ⚠️ Common Misunderstandings “Accessibility = Usability.” → They overlap but are not identical; a site can be usable for the general public yet still block screen‑reader users. “If a product is “universal,” it’s automatically accessible.” → Universal design may still overlook specific disability needs (e.g., tactile cues for blind users). “WCAG‑A compliance is enough for legal compliance.” → Most laws (ADA, Section 508) require AA or higher. “Assistive tech is only for severe disabilities.” → It benefits a spectrum, from mild vision loss (screen magnifiers) to total blindness (screen readers). 🧠 Mental Models / Intuition “Barrier‑Removal Funnel” – Visualize a funnel where each layer (physical, cognitive, sensory) must be cleared for a user to flow through a system. If any layer remains blocked, accessibility fails. “One‑Size‑Fits‑All ≠ Accessible” – Imagine a shoe store that only sells size 9 shoes; most customers fit, but many are excluded. Universal design offers multiple sizes; accessible design adds custom orthotics for those who need them. 🚩 Exceptions & Edge Cases Shared‑Space Pedestrian Areas – Lack of tactile cues can unintentionally bar visually impaired walkers. Voting Accessibility – While the UN CRPD mandates accessible polling stations, implementation may vary; some jurisdictions still require supplemental assistive voting devices. WCAG‑AAA – Rarely required legally; only mandatory when the content’s purpose specifically demands the highest level (e.g., critical health information). 📍 When to Use Which Choose WCAG Level → If the project is a federal website → AA mandatory. If it’s a private commercial site → AA is best practice; A may be acceptable but risky. Assistive vs. Adaptive → User has no existing device that can be modified → procure assistive. User already uses a device but struggles → explore adaptive solutions first. Universal Design vs. Visitability → New housing project → adopt both (universal for all occupants, visitability for baseline wheelchair access). 👀 Patterns to Recognize “Alt‑Text Missing + Non‑semantic HTML” → Classic WCAG‑A violation. “Low Contrast + Small Font” → Signals a WCAG‑AA failure for low‑vision users. “Single‑modal navigation (e.g., hover‑only menus) → Triggers WCAG‑AA operability issue for keyboard‑only users. “No tactile paving at curb cuts → Flag for shared‑space barrier in public‑space design. 🗂️ Exam Traps Distractor: “Universal design automatically satisfies Section 508.” – Wrong; Section 508 requires specific technical criteria (WCAG) beyond universal design principles. Distractor: “WCAG‑A is sufficient for the ADA.” – Incorrect; ADA enforcement generally expects at least WCAG‑AA. Distractor: “Assistive technology is only for blindness.” – Misleading; it spans visual, auditory, motor, and cognitive impairments. Distractor: “Visitability only concerns wheelchair users.” – Overly narrow; it also benefits parents with strollers, movers, and aging adults. --- Use this guide for rapid recall before your exam—focus on the bolded “must‑remember” facts, walk through the step‑by‑step processes, and beware of the common traps.