Clinical neuropsychology is the application of the knowledge of brain-behavior relationships to the clinical setting. Neuropsychologists will integrate the history, behavioral observations, test scores, and response processes and interpret them in terms of how different brain systems are contributing to the adaptive process. While neuropsychologists are always developing new tests and do administer measures other evaluators do not, it is the theory underlying the interpretation that makes it unique rather than the specific tests that are administered. Employing theory of brain behavior relationships, neuropsychologists can often integrate findings that on the surface appear unrelated but are coherent when one understands the brain systems underlying particular performance demands.