Conduct a usability testing script for new features

Five Users Is the Right Number

Five users is the famous Nielsen Norman Group finding: 85% of usability issues surface with 5 test participants. Usability Testing 101 remains the canonical reference; Maze's usability research writing operationalizes it for unmoderated remote testing. The script discipline — defined scenarios, think-aloud protocol, severity scale — turns usability testing from observational to actionable.

How the Conduct a usability testing script for new features Prompt Works

The prompt structures the 5-user test into three tasks with scenario setups, success criteria, and a severity scale. The post-task question set surfaces mental model mismatches that observation alone misses. The "one finding we'll fix this sprint vs. one we'll discuss first" split is the pragmatic output — not every finding deserves immediate action.

When to Use It

• A new flow is ready for pre-launch usability validation.
• PM and design disagree about whether the flow is intuitive.
• A redesign is proposed and needs before/after usability comparison.
• A new PM wants to establish user research rituals.
• A launch is blocked on unclear usability risks.

Common Pitfalls

• Testing with 20 users before making changes. After 5, you learn little new. Fix the findings, then re-test.
• No severity scale. All findings look equal without a scale. Severity 1 noise vs. severity 5 blocker is decision-relevant.
• Leading users through confusion. Assisting too quickly masks the issue. Let them struggle long enough to surface the mental model.

Sources

• Usability Testing 101 — Nielsen Norman Group
• Maze Blog — Maze
• Which UX Research Methods — Nielsen Norman Group
• Dovetail Blog — Dovetail