
Daniel Kahneman wrote about his experiences with the inside/outside bias. Kahneman, a team of graduate students, and the Dean of the Hebrew University School of Education collaborated on curriculum for judgment and decision-making for high schools. At one point, Kahneman surveyed his team to estimate the amount of time remaining to complete project.
The group’s opinion ranged from 18 to 30 months. The Dean, who had developed several textbooks in the past, initially concurred with the group. But Kahneman prodded him on the timelines for his other projects, at which point the Dean reflected and responded previous teams completed these projects in 7 to 10 years’ time. Thinking as an insider, a member of the team, the Dean dramatically underestimated the scope of the project remaining, despite his expertise. Ultimately, the book was completed eight years later. Inside/outside bias.