Atomic Habits Framework (James Clear)

James Clear's "Atomic Habits" isn't a productivity system — it's a behavior-change operating system that makes every other productivity system actually stick. The Four Laws framework — make it obvious, attractive, easy, and satisfying — gives you a diagnostic checklist for any habit you're trying to build or break. The "two-minute rule" (scale any habit down to two minutes to start) defeats the activation energy that kills most systems. Habit stacking (attach new habits to existing ones) leverages neural pathways you've already built. The book has sold over 15 million copies because it works for exercise, diet, reading, meditation, and yes, productivity. It's the meta-system.