The National Association of Social Workers (NASW) and the Association of Social Work Boards (ASWB) have developed Best Practice Standards in Social Work Supervision to support and strengthen supervision for professional social workers. The standards provide a general framework that promotes uniformity and serves as a resource for issues related to supervision in the social work supervisory community.
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http://www.socialworkers.org/practice/naswstandards/supervisionstandards2013.pdf