review-ux-ui

pjt222

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Diese Fähigkeit führt umfassende UX/UI-Prüfungen durch, indem sie Nielsens Heuristiken, die WCAG 2.1-Barrierefreiheitsstandards und Benutzerflussanalysen anwendet. Sie ist für Entwickler konzipiert, um Benutzeroberflächen vor der Veröffentlichung auf Usability, Barrierefreiheit und kognitive Belastung zu überprüfen. Nutzen Sie sie für heuristische Evaluationen, Barrierefreiheitskonformitätsprüfungen und Bewertungen der Formularbedienbarkeit.

Schnellinstallation

Claude Code

Dokumentation

Review UX/UI

Evaluate UX and UI for usability, accessibility, and effectiveness.

When to Use

Usability review before release
Accessibility audit (WCAG 2.1 AA or AAA)
User flow evaluation for efficiency and error prevention
Form review for usability and conversion
Heuristic evaluation of an existing interface
Cognitive load and information architecture assessment

Inputs

Required: Application to review (URL, prototype, or source)
Required: Target user (roles, technical proficiency, context)
Optional: User research (interviews, surveys, analytics)
Optional: WCAG target (A, AA, or AAA)
Optional: Specific user flows to evaluate
Optional: Assistive tech to test with (screen reader, switch access)

Procedure

Step 1: Heuristic Evaluation (Nielsen's 10 Heuristics)

Evaluate against each heuristic:

#	Heuristic	Key Question
1	Visibility of system status	Does the system always inform users about what is happening?
2	Match between system and real world	Does the system use familiar language and concepts?
3	User control and freedom	Can users easily undo, redo, or exit unwanted states?
4	Consistency and standards	Do similar elements behave the same way throughout?
5	Error prevention	Does the design prevent errors before they occur?
6	Recognition rather than recall	Are options, actions, and information visible or easily retrievable?
7	Flexibility and efficiency of use	Are there shortcuts for experienced users without confusing novices?
8	Aesthetic and minimalist design	Does every element serve a purpose? Is there unnecessary clutter?
9	Help users recognize, diagnose, and recover from errors	Are error messages clear, specific, and constructive?
10	Help and documentation	Is help available and easy to find when needed?

Rate violation severity:

Severity	Description
0	Not a usability problem
1	Cosmetic — fix if time allows
2	Minor — low priority
3	Major — high priority
4	Catastrophic — must fix before release

## Heuristic Evaluation Findings
| # | Heuristic | Severity | Finding | Location |
|---|-----------|----------|---------|----------|
| 1 | System status | 3 | No loading indicator during data fetch — users click repeatedly | Dashboard page |
| 3 | User control | 2 | No undo for item deletion — only a confirmation dialog | Item list |
| 5 | Error prevention | 3 | Date field accepts invalid dates (Feb 30) | Booking form |
| 9 | Error recovery | 4 | Form submission error clears all fields | Registration |

Got: All 10 heuristics evaluated with findings and severity ratings. If fail: If short on time, focus on heuristics 1, 3, 5, and 9.

Step 2: Accessibility Audit (WCAG 2.1)

Perceivable

1.1.1 Non-text content: Images have alt text (decorative use alt="")
1.3.1 Info and relationships: Semantic HTML (headings, lists, tables, landmarks)
1.3.2 Meaningful sequence: DOM order matches visual order
1.4.1 Use of colour: Colour is not the only means of conveying information
1.4.3 Contrast: Text contrast ≥ 4.5:1 (normal), ≥ 3:1 (large)
1.4.4 Resize text: Text resizes to 200% without loss of function
1.4.11 Non-text contrast: UI components and graphics ≥ 3:1 contrast
1.4.12 Text spacing: Works with line height 1.5x, letter spacing 0.12em, word spacing 0.16em

Operable

2.1.1 Keyboard: All functionality operable via keyboard
2.1.2 No keyboard trap: Focus never trapped
2.4.1 Skip links: Skip navigation link present
2.4.3 Focus order: Tab order follows logical sequence
2.4.7 Focus visible: Keyboard focus indicator visible
2.4.11 Focus not obscured: Focused element not hidden behind sticky headers/overlays
2.5.5 Target size: Targets ≥ 24x24px (44x44px on touch)

Understandable

3.1.1 Language of page: lang attribute set on <html>
3.2.1 On focus: Focus does not trigger unexpected changes
3.2.2 On input: Input does not trigger unexpected changes without warning
3.3.1 Error identification: Errors clearly described in text
3.3.2 Labels or instructions: Form inputs have visible labels
3.3.3 Error suggestion: Error messages suggest fixes

Robust

4.1.1 Parsing: HTML valid (no duplicate IDs, proper nesting)
4.1.2 Name, role, value: Custom components have ARIA roles
4.1.3 Status messages: Dynamic content changes announced to screen readers

Got: WCAG 2.1 AA criteria checked with pass/fail per criterion. If fail: Use axe-core or Lighthouse for initial scan, then manual testing for criteria needing human judgement.

Step 3: Keyboard and Screen Reader Audit

Keyboard Navigation Test

Using only Tab, Shift+Tab, Enter, Space, Arrow keys, Escape:

## Keyboard Navigation Audit
| Task | Completable? | Issues |
|------|-------------|--------|
| Navigate to main content | Yes — skip link works | None |
| Open dropdown menu | Yes | Arrow keys don't work within menu |
| Submit a form | Yes | Tab order skips the submit button |
| Close a modal | No | Escape doesn't close, no visible close button in tab order |
| Use date picker | No | Custom date picker not keyboard accessible |

Screen Reader Test

Test with NVDA (Windows), VoiceOver (macOS/iOS), or TalkBack (Android):

## Screen Reader Audit
| Element | Announced As | Expected | Issue |
|---------|-------------|----------|-------|
| Logo link | "link, image" | "Home, link" | Missing alt text on logo |
| Search input | "edit, search" | "Search products, edit" | Missing label association |
| Nav menu | "navigation, main" | Correct | None |
| Error message | (not announced) | "Error: email is required" | Missing live region |
| Loading spinner | (not announced) | "Loading, please wait" | Missing aria-live or role="status" |

Got: Task flows tested with keyboard-only and screen reader. If fail: If screen reader unavailable, inspect ARIA attributes and semantic HTML as proxy.

Step 4: Analyse User Flows

Map and evaluate key user flows:

## User Flow: Complete a Purchase

### Steps
1. Browse products → 2. View product → 3. Add to cart → 4. View cart →
5. Enter shipping → 6. Enter payment → 7. Review order → 8. Confirm

### Assessment
| Step | Friction | Severity | Notes |
|------|---------|----------|-------|
| 1→2 | Low | - | Clear product cards |
| 2→3 | Medium | 2 | "Add to cart" button below the fold on mobile |
| 3→4 | Low | - | Cart icon updates with count |
| 4→5 | High | 3 | Must create account — no guest checkout |
| 5→6 | Low | - | Address autocomplete works well |
| 6→7 | Medium | 2 | Card number field doesn't auto-format |
| 7→8 | Low | - | Clear order summary |

### Flow Efficiency
- **Steps**: 8 (acceptable for e-commerce)
- **Required fields**: 14 (could reduce with address autocomplete + saved payment)
- **Decision points**: 2 (size selection, shipping method)
- **Potential drop-off points**: Step 4→5 (forced account creation)

Got: Critical user flows mapped with friction points rated. If fail: Without analytics, assess flows by task complexity and step count.

Step 5: Assess Cognitive Load

Information density: Amount of information per screen appropriate?
Progressive disclosure: Complex information revealed gradually?
Chunking: Related items grouped visually (Gestalt principles)?
Recognition over recall: Users see options rather than remember them?
Consistent patterns: Similar tasks use similar interaction patterns?
Decision fatigue: Too many choices at once? (Hick's law)
Working memory: Users need to remember information across steps?

Got: Cognitive load assessed with overload or underload areas identified. If fail: Use the "squint test" — squint at the screen and check if structure and hierarchy remain apparent.

Step 6: Review Form Usability

For each form:

Got: Each form assessed against the checklist with issues documented. If fail: With many forms, prioritize highest-traffic ones (registration, checkout, contact).

Step 7: Write the UX/UI Review

## UX/UI Review Report

### Executive Summary
[2-3 sentences: overall usability, most critical issues, strongest aspects]

### Heuristic Evaluation Summary
| Heuristic | Severity | Key Finding |
|-----------|----------|-------------|
[Summary table from Step 1]

### Accessibility Compliance
- **Target**: WCAG 2.1 AA
- **Status**: [X of Y criteria pass]
- **Critical failures**: [List]

### User Flow Analysis
[Key friction points with severity and recommendations]

### Top 5 Improvements (Prioritised)
1. **[Issue]** — Severity: [N] — [Specific recommendation]
2. ...

### What Works Well
1. [Specific positive observation]
2. ...

Got: Review provides prioritised, actionable recommendations with severity ratings. If fail: With too many issues, categorise into "must fix" (severity 3-4) and "should fix" (severity 1-2).

Validation

All 10 Nielsen heuristics evaluated with severity ratings
WCAG 2.1 criteria checked (at minimum: 1.1.1, 1.4.3, 2.1.1, 2.4.7, 3.3.1, 4.1.2)
Keyboard navigation tested for key user flows
Screen reader tested (or ARIA/semantic HTML reviewed as proxy)
At least one critical user flow analysed for friction
Cognitive load assessed
Form usability evaluated
Findings prioritised by severity with actionable recommendations

Pitfalls

Confusing UX with visual design: UX is how it works; visual is how it looks. Beautiful interfaces can have terrible UX. Evaluate both but distinguish them.
Testing only the happy path: Error states, empty states, loading states, and edge cases are where UX problems hide.
Ignoring real devices: Browser dev tools responsive mode is a proxy. Real device testing catches touch, performance, and viewport issues.
Accessibility as an afterthought: Accessibility issues found late are expensive to fix. Evaluate early and continuously.
Personal preference as UX feedback: "I would prefer..." is not UX feedback. Cite heuristics, research, or established patterns.

Related Skills

review-web-design — visual design review (layout, typography, colour)
scaffold-nextjs-app — Next.js application scaffolding
setup-tailwind-typescript — Tailwind CSS for design system

GitHub Repository

pjt222/agent-almanac

Pfad: i18n/caveman-lite/skills/review-ux-ui

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