The one-parameter psychometric model known as the Rasch model is described and examined. The basic principles underlying the model and the concepts of unidimensionality, local stochastic independence, and additivity are explained in non-mathematical terms. The requirements of measurement procedures, the measurement of latent traits, the control on…

Recent developments in cognitive and educational psychology, such as increased appreciation of the situated nature of learning and understanding, call for broader ranges of student models and types of data than those standard in testing today. We must specify how what we observe on the test is related to competence as we conceptualize it, and…

Reviews recent theoretical, methodological, and analytical developments in language testing, focusing on more refined models of language ability, reliability and validity, performance testing, innovative test formats, new applications of Item Response Theory and Generalizability Theory to test performance. An annotated bibliography discusses seven…

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…