The purpose of A Developmental Evaluation Companion is the same as that of the original A Developmental Evaluation Primer — to introduce the concept to changemakers, and to the evaluators, critical friends and reality testers, who are their partners in that change journey. The aim is to provide an overview of the essential elements  of Developmental Evaluation (DE) to create some coherence, not to present any one version of DE as the right one. There is an ever-expanding set of views, resources and even critiques on DE, which signals to us that the field is very much alive. The intent of this companion is to encourage going deeper and wrestling with the many issues and ideas presented.