Product Design - Module 10

Hello, and welcome to Module 10: Usability Testing and Design Iteration, where we will explore how to test designs with real users, analyze feedback, enhance usability, and document design decisions to achieve better product outcomes.

What This Module Covers

This module focuses on four key areas of the product design process:
• Conducting usability tests
• Analyzing user feedback and identifying issues
• Iterating on designs to improve user experience
• Documenting changes and decisions

Key Takeaway: Great products are not built on assumptions—they are refined through user testing.

What is Usability Testing?

Usability testing is a method of observing real users as they interact with your design.

Through usability testing, you can:
• Identify confusion, errors, and friction
• Understand why users struggle, not just what they click
• Validate or challenge your design assumptions
• See how real people actually use your product

Key Takeaway: Watching users interact with your design reveals insights that no theory can provide.


Why Usability Testing Matters

Usability testing is essential because it:
• Reveals real user pain points
• Prevents expensive mistakes later in development
• Improves clarity, accessibility, and flow
• Supports user-centered decision-making
• Saves time by reducing rework and back-and-forth

Key Takeaway: Early testing saves time, money, and effort in the long run.


Types of Usability Testing

There are different ways to test usability depending on your goals and resources.

Moderated Testing

A facilitator guides the user through the session and asks follow-up questions.

Unmoderated Testing

Users complete tasks on their own without a facilitator present.

Remote Testing

Conducted online using tools such as Zoom, Figma Mirror, Maze, or UserTesting.

In-Person Testing

Also called “guerrilla testing,” this is done face-to-face and allows you to observe body language and physical reactions.

Key Takeaway: Different testing methods provide different levels of insight.

How to Prepare for Usability Testing

Successful usability testing requires careful planning.

Define Testing Goals

Clearly state what you want to learn, what problems you are trying to uncover, and what decisions the test should support.

Select Users

Choose five to seven participants who represent your target audience.

Prepare Tasks

Design realistic tasks that reflect how users would normally use the product.

Avoid Leading Questions

Ask open-ended questions that allow users to express themselves freely instead of pushing them toward a specific answer.

Set Up Recording Tools

Record sessions so you can review interactions, expressions, and behavior later.

Key Takeaway: Well-prepared tests lead to meaningful and actionable insights.


Final Note

Usability testing is not about proving that your design is right—it is about learning how to make it better. By observing real users, analyzing feedback, and iterating thoughtfully, designers create products that are clearer, more accessible, and truly centered on user needs.