Lack of clinical exposure and training may leave the child and adolescent psychiatrist unprepared to evaluate testing data. This Workshop provides a practical framework for reviewing and interpreting neuropsychological testing and applying the findings to a clinical profile. It describes how neuropsychologists develop a hypothesis, decide which testing instruments to use, and organize data in a meaningful way. It then provides the child and adolescent psychiatrist with a structured, coherent way to organize testing information that can be applied to the biopsychosocial formulation. Starting with how to generate referral requests likely to yield clinically useful information, commonly used tests of neuropsychological and educational functioning are reviewed. Test selection criteria unfamiliar to non-neuropsychologists are highlighted. Issues included are: test sensitivity and validity; confounders affecting performance; the impact of timing on performance; problems with extrapolating from an adult testing model; and why two standardized tests administered appropriately can contradict each other. Current inter-disciplinary issues surrounding diagnosis and nomenclature using nonverbal learning disorders and executive function disorders as examples are reviewed.  Ways to reach consensus and collaboration with the school team are described.