This course examines classical test theory and the application to the practice of assessment. At a foundational level, model assumptions are explored and used to understand the development of different notions of reliability and dependability. At a practical level, statistical techniques developed from the theory are applied to develop and/or improve assessment practices. Topics treated include true score model of classical test theory and its assumptions and properties, similarities and differences between parallel, tau-equivalent, essentially tau-equivalent, and congeneric tests, methods for estimating reliability and validity. An item and reliability analysis will be conducted and results used to develop a new test or improve an existing one.