Psychological testing or Psychological assessment is a field characterised by the use of samples of behaviour in order to infer generalisations about a given individual. By samples of behaviour, 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 behaviour of the individual being tested to the responses of a norm group. The broad categories 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. This book presents new and important research from around the world.