This chapter introduces the theoretical basis for restorative justice (RJ). It assesses the empirical evidence for RJ programs, and explores the challenges and opportunities associated with applying core competencies. The chapter describes competencies of specific interest which include: engaging diversity and difference in practice, and engaging with individuals, families, groups, organizations, and communities. It also discusses skills essential to the success of RJ which include supporting processes that value the experiences of people associated with a crime or harm. The chapter suggests the importance of practical and context-specific knowledge and skills relevant when individuals, families, groups, organizations, and communities find themselves in conflict and require support. Programs that rely upon restorative principles have been used at a variety of points in the criminal justice process. The chapter discusses a practice, a family group conference, which was first developed in New Zealand involving social workers considerably.