This paper provides a summary of a novel and integrated way to think about the item response models (most often used in measurement applications in social science areas such as psychology, education, and especially testing of various kinds) from the viewpoint of the statistical theory of generalized linear and nonlinear mixed models. In addition,…

Classical test theory and correlational techniques such as factor analysis have been unable to deal with many language tests' measurement problems. The Partial Credit Model, a latent trait model for the analysis of data scored in ordered categories, is used to construct and analyze an oral interview test of English as a Second Language. (28…

Describes the strong power of tests and the fact that tests lead to far-reaching and high stakes decisions and consequences about individuals and groups. Proposes a number of assessment strategies that are based on democratic principles. (Author/VWL)

Explored the relative contributions to Test of English as a Foreign Language (TOEFL) score dependability of various numbers of persons, items, subtests, languages, and their various interactions. Sampled 15,000 test takers, 1000 each from 15 different language backgrounds. (Author/VWL)

Describes the use of the partial credit form of the Rasch model in the analysis and calibration of a set of writing tasks in which assessment scales and criteria were adapted to suit each task's specific demands. Potential applications of the partial credit model in language testing are discussed. (Author/CB)

Suggests that any model of washback must include insights from the theory of educational innovation to help explain why tests do not always have the desired or feared effect. Key concepts in educational innovation are reviewed, showing how these concepts are manifested in a case study in washback and outlining how they are being applied in recent…