ABSTRACT
This chapter provides a brief overview of classical test theory-item response theory (CTT-IRT) comparisons, advantages, disadvantages, and connections. The emphasis is on CTT-IRT differences in concepts and features (e.g., different scales for person and item parameters, and different types of standard errors), which make it difficult to integrate classical and IRT-based information on test scoring, rescaling, and other psychometric procedures. The goal is to prepare the ground for the presentation of the D-scoring method of measurement (DSM) as a unified framework of classical and latent analysis of test data.
