The document summarizes the history of psychological testing from its origins in the late 19th century to the modern era. It describes how early tests focused on measuring reaction time and sensory abilities but shifted to measuring intelligence through tests developed by Binet, Goddard, Yerkes, and others. These early intelligence tests were widely used but also criticized for labeling and segregating minorities. The testing field grew in the 20th century but also faced criticisms over privacy, bias, and misuse of results to discriminate. Despite failures, testing continues to be used widely in education to assess students and programs.