To make effective use of this text, however, readers must possess a thorough understanding of ADHD as a clinical condition. To that end, the editor offers a beginning chapter dealing with "the emerging understandings of attention-deficit disorders and comorbidities." Unfortunately, the chapter falls far short of a thorough, scientific review of the literature that would give readers a firm foundation for understanding the vulnerability of those with ADHD to comorbid conditions. Instead, it presents a rather unidimensional view of the editor's beliefs about the field of ADHD, including his perception that attention problems are central to ADHD. In fact, Dr. Brown goes so far as to state that "the title of this book uses the term attention-deficit disorder to emphasize the centrality of attention impairments, with or without hyperactivity, in the disorder."