Psychological testing has grown exponentially as techological advances have permitted it to and societal complexities have necessitated it's growth. Psychological testing or Psychological assessment is a field characterized by the use of samples of behavior in order to infer generalizations about a given individual. By samples of behavior, one means observations over time of an individual performing tasks that have usually been prescribed beforehand. These responses are often compiled into statistical tables that allow the evaluator to compare the behavior of the individual being tested to the responses of a norm group. The broad catagories of psychological evaluation tests include: Norm-referenced, IQ/achievement tests, Neuropsychological tests, Personality tests, Objective tests (Rating scale), Direct observation tests, Psychological evaluations using data mining. New and important research is presented in this book.