The document traces the history of psychological testing from its origins in China and Europe in the 1800s to its modern use today. It describes how early tests focused on measuring reaction time and sensory abilities but later shifted to measuring intelligence through tests developed by Binet and Simon. Widespread testing began during WWI when the Army used tests to classify recruits, leading to a boom in testing through the 1940s when tests were used to assess personality and vocational fit. However, testing was later criticized for biases against women and minorities and seen as invasive of privacy. While controversial, testing continues to be used widely in education to assess student and program performance.