This book is a mainstream undergraduate text. It is written at a level accessible to students with little background in either evolutionary biology, or developmental biology. But it proceeds from the basics to a sufficiently high level that, on reaching the end of the book, students will have acquired an in-depth knowledge of how development evolves.?? Importantly, the book includes basic population-based evolutionary concepts, as well as comparative developmental genetics and other elements. This makes it different from other evolution textbooks and books devoted to evolutionary developmental biology. It is organized on conceptual lines: most chapters are devoted to particular themes rather than to particular examples. Case-studies on particular systems (e.g. animal segmentation) appear as appropriate - i.