Watch for
Planning without a real contingency for failure.
Belief & ConfidenceBias #15
Optimism Bias
We often expect better outcomes for ourselves.
The tendency to believe that we are less likely than others to experience negative events and more likely to experience positive ones.
Why it matters: Tali Sharot's research shows the optimism bias is wired into the brain. It protects mental health but distorts risk assessment.
Try this
Use a pre-mortem: imagine the project has failed and work backward to identify what went wrong.
Real-world example
Assuming your project will finish on time because delays happen to other teams, not yours.
Key researchers
Tali Sharot, Neil Weinstein
First described in 1980
Psychological mechanism
Selective Neurological Updating. Brain scans reveal that the frontal cortex selectively integrates positive future information into its predictive models while actively blunting or discounting negative risk data, prioritizing mood regulation over objective accuracy.
Seminal research
Neil D. Weinstein (1980), "Unrealistic optimism about future life events." Later mapped neuroscientifically by Tali Sharot (2011) in The Optimism Bias.
Related Biases
Below is a realistic scenario. Read it, then choose what you would do. The feedback will show whether a cognitive bias influenced your choice — not to judge, but to reveal the pattern in action.
Thought Experiment
This experiment places you in a realistic decision. Your instinctive choice will reveal whether bias is at work.
STEP 1 → ReadSTEP 2 → ChooseSTEP 3 → Reveal
Debrief
Optimism bias is not a mistake — it is a feature of a healthy brain. Most people are optimistic about their future, and this predicts better mental health. The risk is in high-stakes planning where optimism leads to insufficient contingency. The pre-mortem technique (imagine failure, then explain it) forces you to engage with what could go wrong.
Sources
Original ResearchWeinstein (1980) — Unrealistic optimism
EncyclopediaWikipedia overview