The document discusses the history and evolution of social casework as a method of social work. It outlines how social casework began as informal helping by individuals throughout history but became a more formal, professionalized method in the late 19th/early 20th century. Key developments included the establishment of charity organizations in the US and UK in the 1800s that used volunteers and later paid agents to assess individual needs, and the opening of the first US School of Social Work in 1898 in response to modern problems requiring specialized training. The document then discusses how early 20th century developments like standardized training programs and the publication of Mary Richmond's influential book "Social Diagnosis" helped establish social casework as a core method of the social work profession.