This article illustrates the use of generalizability theory in special education to estimate the reliability of a measure when there is more than one source of error in the universe of inference and how the effects from changing the number of items and/or raters can be evaluated. (Author)

Questions the construct validity, representatives of the norms, and reliability of the Kaufman Assessment Battery for Children. While the K-ABC is attractively produced and easy to administer, reliance on a particular theory restricts the range of cognitive abilities sampled. (JAC)

Study was designed to provide some indication as to whether the gain in test reliability from confidence scoring results from relevant or irrelevant sources. If the increase in reliability is the result of a gambling response style, it is conceivable that validity could actually decrease even though reliability is increased. (Authors/CB)

The results of this study show that, below ten years of age, stability in IQ scores from group verbal tests is considerably below that for Stanford-Binet. Non-verbal IQ scores were found to have substantially less stability than verbal IQs. (Author/DEP)

The stability and change of verbal, non-verbal, and total IQ scores from group tests were investigated for students tested at Grades 1, 2, 4, 7, 9, and 11. Conclusions are discussed in detail, and the following recommendations are made: (1) Group intelligence tests should not be routinely administered in Grades 1 and 2 unless the users and…

Since 1941, this book has been a standard textbook in educational measurement. As in the previous editions, the selection and treatment of topics were guided by the knowledge and skills that are necessary for the development of valid evaluation measures and the knowledge and competencies needed to interpret teacher-made and standardized tests.…