Article commented on a study by Harris, who presented formulas for the variance of errors of estimation (of a true score from an observed score) and the variance of errors of prediction (of an observed score from an observed score on a parallel test). (Author/RK)

A computer simulation study was conducted to investigate Subkoviak's index of reliability for criterion-referenced tests, called the coefficient of agreement. Results indicate that the index can be adequately estimated. (JKS)

This article is a reply to a previous paper (see TM 500 488) interpreting Livingston's original article (see TM 500 487). (CK)

A reliability coefficient for criterion-referenced tests is developed from the assumptions of classical test theory. The coefficient is based on deviations of scores from the criterion score, rather than from the mean. (Author/CK)

An alternative interpretation of Livingston's reliability coefficient (see TM 500 487) is based on the notion of the relation of the size of the reliability coefficient to the range of talent. (Author/CK)