Test: measurement devise or technique used to quantify behavior or aid in the understanding and prediction of behavior. Scale: relate raw scores on test items to some defined theoretical or empirical distribution. Covert behavior: takes place within an individual and cannot be directly observed. (feelings, and thoughts, for example) Ability: achievement, aptitude and intelligence are different types of ability. Measure skills in terms of speed, accuracy, or both. Achievement: previous learning (like a test that measures how many words you can spell correctly) Aptitude: the potential for learning or acquiring a specific skill. Intelligence: measures potential to solve problems, adapt to changing circumstances and profit from experience. Personality test: related to overt and covert dispositions of the individual. Like, the tendency for a person to show a certain response or behavior in a given situation. Structured test: provide a statement of the self-report variety - choose between y/n or true/false.