Log your decisions, the mental models you applied, and what happened. Build a track record that reveals your thinking patterns.
The most valuable thinking skill isn’t knowing mental models — it’s knowing which ones you actually use, which ones you neglect, and whether your decisions improve over time. A thinking journal creates that feedback loop.
Each entry captures three things: the decision you faced, the mental models you applied, and (later) what actually happened. Over time, patterns emerge — you’ll see which models you default to, which situations still trip you up, and whether your decision quality is genuinely improving.
All data stays in your browser. Nothing is sent to any server.
Related models: Bayesian Updating, Feedback Loops, Thinking in Bets