How do we measure success in peacebuilding projects? What are the elements for success and are these relevant across different conflict contexts? These are vexing questions for which the field of peacebuilding does not have easy answers. Yet, unless there is a reliable pool of systematic evaluations, it is difficult to talk of lessons learned or good practices in peacebuilding. Building Peace: Practical Reflections from the Field is an important step toward documenting and evaluating thirteen diverse projects with a view to distilling broader lessons. Its overall conclusion is that there is no single methodology for evaluating peacebuilding. Instead, diverse approaches contribute to peacebuilding in different ways. Nonetheless, these share certain common themes that are critical for success.