Usability Testing

Planning

• 5 participants per round (catches ~85% of issues)
• 4-6 tasks per session (1 hour max)
• Mix task types: specific ('Find X') and open ('Explore the settings')

Task Writing

• Scenario-based: 'Your friend recommended a restaurant. Find it and make a reservation.'
• No clues in the task: don't use the same words as the UI labels
• One clear success criteria per task

During the Session

• 'Think aloud' protocol: ask users to verbalize their thinking
• Don't help, guide, or react to mistakes
• Take notes on: what they did, what they said, what they seemed to feel
• Record with permission (screen + face)