In order to scale Agile we need a scalable, yet Agile-friendly, organizational architecture. That’s the subject of this book. Granted, several practices of Agile software development have gone mainstream. Even enterprise IT has adopted them. The industry has come a long way from 2001 when the Agile Manifesto was authored. But the pioneers have made further progress during this time. They have gone from continuous integration to continuous delivery, from quarterly releases to daily releases, from manually configured infrastructure to automated infrastructure, from incremental development to iterative development, from points-based estimation to no estimation,1 and so on.