Book excerpt: Most people accessing mental health and addiction services have experienced trauma. For those working in community services, treatment agencies and hospitals, providing "trauma-informed care" requires an understanding of the effects of trauma, and of how to create programs, spaces and policies that place priority on trauma survivors' safety, choice and control. Becoming Trauma Informed describes trauma-informed practice at the individual, organizational and systemic levels. This multi-authored collection brings together the voices of those who have integrated trauma-informed principles into various mental health and addiction treatment and social service environments, and of the diverse groups with which they work. Becoming Trauma Informed is an important resource for those who are working, or who are planning to work asaddiction andmental healthpractitioners and program and system planners."