Psychometrics is the field of study that focuses on measuring psychological attributes such as intelligence, personality, and attitudes. It involves the development and validation of assessment tools, like tests and questionnaires, to quantify these traits reliably and accurately. The main goal of psychometrics is to ensure that these measurements are both valid, meaning they accurately reflect what they intend to measure, and reliable, meaning they produce consistent results over time. This discipline is essential in various areas, including education, clinical psychology, and human resources, where understanding individual differences is crucial.