The National Association for the Dually Diagnosed (NADD) is a non-profit membership organisation founded in 1983 by Dr Robert Fletcher.
[1] It provided services and advocation for people who have a dual diagnosis of mental health disorders and developmental disabilities.
[2][3] Among other publications, the NADD produces the Diagnostic Manual for Intellectual Disability,[4] which has become an important resource for mental health clinicians.
[5] It also hosts an annual international congress on dual diagnosis.
[6]