Watch
Hindsight bias 0:47
A 47-second explainer of Hindsight bias, narrated over the same demo you can try yourself.
Try the interactive Hindsight bias demo
What this video covers
Hindsight bias is the "I knew it all along" effect: once you know how something turned out, it feels like it was obvious and predictable all along - even if, beforehand, you had no idea. It quietly rewrites your memory of what you expected, which makes it dangerous in research, where it convinces teams they didn't need the study they just ran.
The moment you saw which design won, it probably felt obvious - of course that one did. But a beat earlier you were guessing, maybe even guessing wrong. That gap between "it was a coin toss" and "I knew it all along" is hindsight bias rewriting your memory in real time - and it's why teams convince themselves research only confirmed what they already knew.
