Classical Test Theory
Classical Test Theory (CTT) is a psychometric framework used to analyze the reliability and validity of tests, such as educational assessments or psychological scales. It models observed test scores as the sum of a true score (representing the actual ability or trait) and an error score (due to random measurement error). CTT provides foundational concepts like reliability coefficients, standard error of measurement, and item analysis to evaluate test quality.
Developers should learn CTT when working on educational technology, assessment platforms, or data-driven applications involving test scores, as it helps ensure measurement accuracy and interpret results. It is particularly useful for designing and validating tests in fields like psychology, education, or human resources, where reliable data is critical for decision-making.