The Journal of Mental Health Research in Intellectual Disabilities, the official research journal of NADD, is an interdisciplinary research journal with the purpose of reporting original scientific and scholarly contributions to advance knowledge about mental health issues among persons with intellectual disabilities. The journal will address issues related to the full range of psychopathology among persons with intellectual disabilities (mental retardation), neuro-developmental disorders and autism spectrum disorders, including severe behavior problems, criminality, substance abuse, and genetic phenotypes across the life span. The journal seeks to publish contributions with an emphasis on empirically based research and will include research on characteristics of persons with intellectual and mental health problems; risk and protective factors related to the development and/or prevention of mental health problems in persons with intellectual disabilities; development of screening and diagnostic instruments; effectiveness of behavioral, psychosocial and pharmacological treatment procedures (including group and single subject designs); critical or comparative literature reviews, including quantitative meta-analyses. Occasional conceptual reviews that provide for new understanding of theory or theoretical constructs will also be considered.