Margen
When things turn out well, we remember having seen it coming; when they go wrong, we remember that 'something felt off all along'. Psychologists call it hindsight bias: once you know the ending, the past looks obvious. That's why learning from our own decisions is nearly impossible — memory quietly rewrites itself to make us look good.
The antidote recommended by the psychologist Daniel Kahneman, a Nobel laureate, is charmingly low-tech: a decision journal. Whenever you make a decision that matters — taking a job, moving, investing, quitting something — write half a page: what you're deciding, why, what you expect to happen, what worries you and how you feel. Date it. Into a drawer it goes.
A few months later, reread it. That's where the uncomfortable, valuable part begins: finding out where you were right through analysis and where through sheer luck, which fears were noise and which were information you ignored.
The golden rule: judge the process, not the outcome. A well-made decision can turn out badly, and a reckless one can work out beautifully. Over time, the notebook does something memory cannot: it tells you the truth about how you decide. It's the only witness that never changes its story.