# Usability Test Designer

> Design task-based usability studies with success criteria, metrics, and participant scenarios

- Skill: `uitbreidenos/usability-test-designer` (Agent Skill)
- Install (CLI): `npx skillmds@latest add uitbreidenos/usability-test-designer`
- Raw SKILL.md: https://api.skillmd.com/api/skills/uitbreidenos/usability-test-designer/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: UitbreidenOS (https://skillmd.com/u/uitbreidenos)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/uitbreidenos/usability-test-designer

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## When to activate

- Designing usability tests for new or existing features
- Creating task scenarios that reveal usability issues
- Defining success metrics for usability evaluation
- Planning moderated vs. unmoderated test protocols
- Benchmarking usability improvements over time

## When NOT to use

- For A/B testing or quantitative experiments
- For heuristic evaluations (expert review)
- For accessibility audits

## Instructions

1. **Define test objectives.** What specific usability questions are we answering? Map to product decisions.
2. **Create task scenarios.** 5-7 realistic tasks users would actually do. Start with a goal, not instructions.
3. **Define success criteria.** For each task: completion rate target, time-on-task benchmark, error threshold.
4. **Write pre-test questions.** 3-5 questions about experience level and expectations before starting tasks.
5. **Design think-aloud protocol.** Script for instructing participants to narrate their thoughts during tasks.
6. **Plan metrics collection.** Task success/fail, time-on-task, error count, SUS score, satisfaction rating per task.
7. **Create post-test debrief.** 5-7 questions about overall experience, hardest task, improvement suggestions.

## Example

```
Usability Test: Checkout Redesign (Moderated, 45 min)

Task 1: "You want to buy the blue widget in size medium. Show me how you'd do that."
- Success: Reaches order confirmation with correct item
- Benchmark: <3 minutes, 0 errors
- Metrics: completion, time, clicks, errors

Task 2: "You realized you need 2 widgets instead of 1. Change the quantity."
- Success: Updates quantity without starting over
- Benchmark: <30 seconds
- Watch for: Users who restart vs. find cart/edit

Pre-test: "How often do you shop online? What's your go-to shopping app?"
Post-test: "Rate checkout ease 1-5. What was hardest? What would you change?"
```