If you think about design too late, it’s like lipsticking a pig.

AI-assisted or not.

I found a fantastic, free collection of Laws of UX.

They can help you:

• Come up with better product ideas

• Form stronger hypotheses

• Analyze and understand any usability issues

But do we still need this in 2025?

Yes! I’ve seen again and again that while AI can handle UI, it doesn’t really solve good UX.

The top eight Laws of UX:

1. Aesthetic-Usability Effect

Users perceive aesthetically pleasing designs as more usable.

AI can generate polished visuals, but a good Product Designer ties aesthetics to real usability and Jobs-to-Be-Done.

2. Doherty Threshold

Productivity peaks when responses are <400ms.

AI won’t fix latency. Carefully selected design patterns (skeletons, loaders) keep users engaged.

E.g., try to search for posts on LinkedIn and note animated placeholders.

3. Von Restorff Effect

In a group of similar items, the standout is most remembered.

AI can suggest highlights, but choosing the right primary action needs product/UX insight.

4. Goal-Gradient Effect

Users’ motivation increases as they get closer to completing a task.

AI can show progress, but only humans decide what progress means. Sometimes, we can even start at 20% to boost user motivation ;)

5. Hick’s Law

Decision time grows with the number and complexity of options

AI can reduce noise, but breaking choices into clear steps requires our judgment.

6. Miller’s Law

People hold 7±2 items in memory.

AI can cluster information, but structuring chunks for jobs/goals is a design skill.

E.g., LinkedIn displays 5 primary icons at the top and a group of 4 links in the left menu.

7. Peak-End Rule

People recall the peak and end moments more than the entire journey.

AI can add flair, but choosing and shaping those high-impact moments is a team's job.

E.g., HubSpot celebrates creating an account with animated confetti.

8. Postel’s Law

Be flexible in what you accept, strict in what you output.

Imagine a phone number form: an AI agent could enforce one strict format, but that’s unnecessary and frustrating. Better design accepts variation and normalizes it (e.g., Instagram account).

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Complete collection by Jon Jablonski: linkedin.com/feed/updat…

Examples for PMs: productcompass.pm/p/12-…

Hope that helps.

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P.S. Interested in AI PM?

I recommend the AI PM Certification. It’s a 6-week cohort taught by Miqdad Jaffer (Product Lead at OpenAI). I recently joined as an AI Build Labs Leader.

The next session: Oct 18, 2025. A special $550 discount: bit.ly/aipmcohort