The history of generalizability theory (G theory) is told from the perspective of one researcher's experiences, describing psychometric and scientific perspectives that influenced the development of G theory and its adoption. Work that remains to be done in the field is outlined. (SLD)

Classical test theory is founded on the proposition that measurement error, a random latent variable, is a component of the observed score random variable. This article traces the history of the development of classical test theory, beginning in the early 20th century. (SLD)

Continuing attention to test theory, test development, test interpretation and use, test monitoring and control, test consumer education, and the social and political consequences of testing is suggested as the primary concern of the National Council on Measurement in Education (NCME). (CM)