During the past several decades, interest in children’s psychological disorders has grown steadily within the research community, resulting in a burgeoning knowledge base. The majority of the attention and funding, not surprisingly, has focused on the more prevalent and well-known conditions. Although this raises the odds that young people with more well-known disorders such as ADHD, autism, and learning disorders will receive much-needed professional assessment and intervention, children with less frequently encountered disorders may experience a higher risk of misdiagnosis and inappropriate treatment. Useful data has been scattered throughout the literature for severe-but-less-frequent childhood psychological disorders, including: fire setting; gender identity disorder; impulse control disorders (i.e., kleptomania, trichotillomania, intermittent explosive disorder); selective mutism; Munchausen by proxy; childhood schizophrenia; gang involvement; sexual offending; self-injurious behavior; and feral children. This concise volume offers up-to-date information on these conditions, which, though relatively rare, may have profound effect not only on the children themselves but also their families, friends, and the community at large. Coverag e of each disorder is presented in an accessible format covering: Overview and history. Description and diagnostic classification, with proposed changes to the DSM-V. Etiology and theory. Assessment tools and interview protocols. Commonly used psychological and pharmacological treatment options. Current research issues and directions for future investigation. Assessing and Treating Low Incidence/High Severity Psychological Disorders of Childhood is a must-have reference for researchers, clinicians, practitioners, and graduate students in clinical child and school psychology, pediatrics, psychiatry, social work, school counseling, education, and public policy.