HUMAN COMPUTER INTERACTION EXPERT WITNESS TESTIMONY AND UI CONSULTING

A human-computer interaction expert witness delivers professional analysis and testimony on how users interact with digital systems—such as websites, apps, software, or devices—in legal or regulatory cases. And it’s no secret that the field’s best human-computer interaction expert witness providers are especially important in matters involving usability, accessibility, user experience, and deceptive design practices.

HCI is a multidisciplinary field that blends psychology, computer science, design, and ergonomics to understand how people use technology. When serving as a top human-computer interaction expert witness, an HCI professional applies this expertise to evaluate whether a digital product is designed in a way that is clear, fair, and usable—or whether it misleads or disadvantages users.

Testifying in Legal Cases

An HCI pro might be called to testify in a variety of legal matters, including:

• Consumer protection lawsuits: where a company’s website or app allegedly uses deceptive designs (also called dark patterns) to trick users into purchases, subscriptions, or sharing personal data.

• Accessibility cases: involving non-compliance as human-computer interaction expert witness spot with ADA (Americans with Disabilities Act) standards for users with disabilities.

• Product liability claims: if a poorly designed interface leads to user error and harm—such as in medical devices, industrial software, or safety systems.

• Privacy and consent cases: where design influences whether users truly understand and agree to data collection or tracking.

What They Do

An human-computer interaction expert witness may:

• Conduct usability tests to measure how real users interact with a product.

• Analyze interface elements like button placement, visual hierarchy, and content clarity.

• Compare design decisions to industry standards and best practices.

• Prepare reports or testify in court about whether a design is misleading, inaccessible, or unsafe.

Why They Matter

Leading human-computer interaction expert witness span the distance between technology and human behavior. Pros’ work helps judges and juries understand whether a digital experience supports informed user decisions—or undermines them. As digital platforms continue to influence nearly every aspect of life, HCI experts are becoming increasingly vital in technology-related litigation.