Characteristics that we contemporarily define as disabilities have existed in the human population from earliest recorded history. Societal explanations for disability have varied greatly by time and populations in which disabilities have occurred. At various times in history, disability has been viewed as a blessing from deity or the deities, a punishment for sin, or a medical problem. Social workers have worked with persons with disabilities from the inception of the profession, and in recent years, social work has begun to embrace the concept of disability as diversity and to treat disability as diversity and welcome disabled persons as fully participating members of society. Social work has begun welcoming persons with disabilities as fully participating members of society, including valuable members of the profession.