The National Association for the Dually Diagnosed (NADD) is a non-profit membership organisation founded in 1983 by Dr Robert Fletcher.Robert L. Schalock, Pamela C. Baker, M. Doreen Croser; Embarking on a new century: mental retardation at the end of the 20th century AAMR 2002, p135 It provided services and advocation for people who have a dual diagnosis of mental health disorders and developmental disabilities.About the NADDDebora Bell, Sharon L. Foster, Eric J. Mash; Handbook of behavioral and emotional problems in girls Birkhäuser 2005, p245
Among other publications, the NADD produces the Diagnostic Manual for Intellectual Disability,Allan Tasman, Jerald Kay, Jeffrey A. Lieberman, Michael B. First, Mario Maj; Psychiatry John Wiley & Sons 2011, which has become an important resource for mental health clinicians.DM-ID: Testemonials It also hosts an annual international congress on dual diagnosis.News-Medical.net: "Mindfulness" for reducing aggressive behaviour in people with developmental disabilities
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