Usability Testing

Usability Testing is the stage where real users attempt to complete specific tasks on your product (or prototype) while researchers observe, listen, and record their actions, reactions, and difficulties (friction points). The goal is not to judge the user, but to detect usability issues before launch, focusing on efficiency, effectiveness, and satisfaction.

Types of Tests

The way the test is conducted profoundly impacts the quality of the results:

• Moderated Testing: These are conducted live by a moderator (in-person or remotely) who can interact, ask follow-up questions ("What were you thinking here?"), and manage unexpected events. They provide rich qualitative data.
• Unmoderated Testing: Users perform tasks alone at their own pace, from home, with their actions and comments recorded by software. They are faster and less expensive, providing larger quantitative data, but the context of the actions is often less clear.
• Qualitative (5 users) vs. Quantitative (50+): Research has shown that 80% of major usability issues can be found with just five users per iteration (qualitative approach). Quantitative testing is used to measure the impact of these issues (task time, success rate).

Mastering Biases

The most common error is seeking to confirm one's own ideas (confirmation bias). To avoid this, you must:

• Ask open-ended questions and focus on past actions or objectives, not the future ("What do you intend to do?").
• Never give clues or excuses for the product ("This isn't the final version yet, don't worry about that...").
• Encourage users to think aloud (Think Aloud Protocol) without intervening in their process.

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• Moderated tests (live):Video conferencing tools (Zoom, Google Meet) combined with prototyping tools (Figma, Axure).
• Unmoderated tests (remote): Platforms dedicated to user testing such as UserTesting or Lookback.
• Post-launch behavioral analysis: Tools like Hotjar (heatmaps, session recordings).‍
• Recruitment: Specialized platforms (Userlytics) or integrated survey tools.

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Rocket Surgery Made Easy by Steve Krug: This is the simplest and most pragmatic practical guide. It provides a simple, low-cost, and fast methodology for organizing, conducting, and analyzing regular testing sessions. It’s the essential starting point.

Think Like a UX Researcher: How to Observe Users, Influence Design, and Shape Business Strategy by David Travis et Philip Hodgson (Anglais): A more comprehensive methodological book. It teaches how to go beyond simple observation and, crucially, how to transform test results into concrete recommendations that influence overall business strategy.

The Mom Test: How to Talk to Anyone about Your Business Idea and Know if It's a Good One by Rob Fitzpatrick (That's what we call a big title) : This is the crucial interviewing book for the research and pre-validation phase. It teaches you to ask the right questions to get honest feedback and avoid confirmation bias. (This is a must-have that has aged incredibly well.)