The Undoing Project: A Friendship That Changed Our Minds

Why I recommend it

I recommend this account of Daniel Kahneman and Amos Tversky for making the development of behavioral science as much a story of collaboration as of ideas. Lewis shows how an unusually generative partnership exposed recurring errors in judgment and changed fields from economics to medicine.

What stayed with me

The work emerged through intellectual intimacy: two people thinking aloud, challenging each other, and producing something neither could have made alone. The story is also a reminder that insight into human bias does not free any of us from being human in our closest relationships.

Who it’s useful for

Readers interested in decision-making, behavioral economics, creative partnerships, and the complicated human stories behind influential ideas.

A tension or limitation

Lewis is a gifted storyteller, which can make a complex field feel more settled and a partnership more narratively tidy than either was. This is an excellent human introduction, not a comprehensive account of the research or its later replication debates.