July 17, 2026 · 11 min read
The Cheapest Way to Be Wrong
A/B testing is more than optimization. It gives organizations a cheap way to discover where taste, hierarchy, and metrics disagree with reality.
HAAM Notes / Topic
Experimentation
3 notes follow this idea through the HAAM archive.
July 8, 2026 · 18 min read
How Companies Actually Do Data-Driven Design
What Netflix thumbnails, Duolingo streaks, Booking.com experiments, Spotify learning rates, Uber metrics, Airbnb guardrails, and Google's 41 shades of blue reveal about designing with data.
February 5, 2026 · 2 min read
How to Build a CRO + UX Experimentation System That Compounds
A field note on replacing random optimization tricks with a learning loop that respects users and still improves conversion.