CONCEPT
Optimism Bias
The sincere, genuinely held belief that your project is the exception — that the statistical regularities governing every comparable case will somehow be suspended for yours. Cognitive, not strategic; the planner is not lying but deluded.
Optimism bias is the first of the twin engines that drive Flyvbjerg's planning fallacy. Unlike strategic misrepresentation, optimism bias is cognitive rather than political — the planner who produces an optimistic forecast sincerely believes it. The belief is wrong, as the accumulated evidence of hundreds of comparable projects demonstrates, but it is sincere. The planner is not lying. The planner is deluded by the same cognitive architecture that makes humans systematically overconfident in domains characterized by complexity, uncertainty, and long feedback loops. In the AI discourse, optimism bias saturates the engineers and researchers close enough to the technology to be awed by its capabilities and too close to maintain perspective on its limitations.
In The You On AI Field Guide
The distinction between optimism bias and strategic misrepresentation matters because the two call for different corrective interventions. Optimism bias responds to reference class forecasting — forcing the planner to calibrate against the outside view of comparable cases. Strategic misrepresentation responds to
Keep reading with YOU ON AI
Unlock the full book, 10,000+ field-guide entries, and a 1000+ thinker library. If you have a book code, register now — it takes a minute.