Psychological testing refers to the administration of psychological tests. A psychological test is "an objective and standardized measure of a sample of behavior".[1] The term sample of behavior refers to an individual's performance on tasks that have usually been prescribed beforehand. The samples of behavior that make up a paper-and-pencil test, the most common type of test, are a series of items. Performance on these items produce a test score. A score on a well-constructed test is believed to reflect a psychological construct such as achievement in a school subject, cognitive ability, aptitude, emotional functioning, personality, etc. Differences in test scores are thought to reflect individual differences in the construct the test is supposed to measure. The technical term for the science behind psychological testing is psychometrics.
Psychological evaluation is defined as a way of assessing an individual's behavior, personality, cognitive abilities, and several other domains.[1] The purpose behind many modern psychological evaluations is to try to pinpoint what is happening in someone's psychological life that may be inhibiting their ability to behave or feel in more appropriate or constructive ways. It is the mental equivalent of physical examination.