Daniel Kahneman
The central idea is elegant: we have two systems of thought. System 1 is fast, automatic, emotional — it's the pattern matcher. System 2 is slow, deliberate, rational — it's the reasoner.
Most of our mistakes happen when System 1 fires and System 2 doesn't bother to check.
When designing products, you're designing for System 1 in the first 30 seconds and System 2 for everything after.
If someone has to think hard to understand what your product does in the first moment, you've lost. The cognitive load model Kahneman describes maps directly to UX friction.
One of the book's most practically useful concepts. The first number someone hears anchors all subsequent judgments. This is why pricing pages always show the highest tier first.
Useful to know. More useful to catch yourself doing it unconsciously.
Required reading. I re-read chapters periodically. Every chapter has a practical application hiding inside it.