When Everett Rogers introduced the S-shaped diffusion curve in the first edition of his book, he was directly following the data. Researchers like Elihu Katz had already begun studying how change spreads and noticed a consistent pattern in the adoption of hybrid corn and the antibiotic tetracycline.

Yet it was Rogers who shaped our understanding of how ideas spread. Publishing more than 30 books and 500 articles, he studied everything from technology adoption to family planning in remote societies and just about everything in between. In doing so, he laid the foundation for an evidence-based approach to change.

Still, while Rogers showed us how change works, he didn’t offer much insight into why it works that way. This is where I think Michael Morris’s book, Tribal, can be helpful. By ex

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