Duhigg organizes the book into three broad parts covering the habits of individuals, organizations, and societies. Do you think this organization is effective? Do the three part titles effectively unify the nine chapters?

Scientists have designed a wide variety of experiments to analyze habit formation in the brain. Describe five of the experiments that Duhigg discusses in the book. What roles have patients or animals played in those studies?

The author’s case studies are drawn from predominantly American-based companies, organizations, and research labs. Why do you think Duhigg adopted such an American lens? Is there evidence that habit formation in the human brain varies across nationalities?