A formal way to measure traits, feelings, beliefs and abilities that can lead to people's problems. The intention of testing is to gain a deeper, more complete understanding of the problem than can be gained from a brief office visit. In many ways, neuropsychological testing and assessment are similar to medical tests. If a patient has physical symptoms, a primary care provider may order X-rays or blood tests to understand what's causing those symptoms. The results of the tests will help inform and develop a treatment plan. Psychologists use tests and other assessment tools to measure and observe a client's behavior to arrive at a diagnosis and guide treatment. Neuropsychological tests and assessments allow a psychologist to understand the nature of the problem, and to figure out the best way to go about addressing it.