6 categories of research-backed principles. Each one gives you the science to validate AI output—whether you're designing in Figma, coding in Cursor, or shipping with V0.
Why do users click, scroll, and abandon? The answers lie in cognitive psychology. This part reveals the mental models and decision-making patterns behind every user action—from attention and memory limits to perception biases. Master these 27 principles and you'll predict user behavior before you design, not after you ship.
The 30 laws that fix 80% of interface problems. Hick's Law tells you how many options to show. Fitts's Law sizes your buttons. Miller's Law structures your navigation. These aren't opinions—they're peer-reviewed formulas used by Stripe, Linear, and Notion. Apply them and watch conversion rates, task completion, and user satisfaction metrics improve.
Stop solving the same problems twice. This part teaches you to build scalable design systems—from token architecture to component libraries—that ensure consistency across teams, products, and platforms. Learn the information architecture principles that let you build once and deploy everywhere, reducing design debt and speeding up development cycles.
Navigation that users understand instantly. Forms that convert. Error messages that help instead of frustrate. Feedback that builds trust. These battle-tested patterns have been validated across thousands of products—now you can ship them today. No more reinventing solutions to problems that have already been solved.
AI validation, voice UI, AR/VR—these aren't future problems, they're today's design challenges. This part gives you evidence-based principles for emerging interfaces: how to make AI decisions transparent, design conversational flows that feel natural, and create spatial experiences that don't cause disorientation. Design for what's next—with the same rigor you apply to traditional interfaces.
Design that works for 100% of users—not just the 80% in your user testing. Accessibility isn't a feature; it's a baseline. This part covers WCAG compliance, ethical persuasion vs. dark patterns, and inclusive design principles that expand your market while doing the right thing. Build products that empower all users and avoid the legal and reputational risks of exclusionary design.