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)

Tracing the development of the Otis test series, the author argues that there will be a continuing demand for group-administered general mental ability tests in education. He foresees a need for better ways of relating ability test scores with skills and achievements to make them more educationally useful. (Author/JAZ)

Some unfinished issues relating to achievement test theory that seemed implicit in the basic idea of criterion-referenced testing are reviewed, recognizing their importance in current studies of authentic assessment and performance-based tests. The future of performance-based evaluation is explored. (SLD)