Research shows that test method can exert a significant impact on test takers' performance and thereby contaminate test scores. We argue that common test method can exert the same effect as common stimuli and violate the conditional independence assumption of item response theory models because, in general, subsets of items which have a shared…

Describes the nature of recent changes in the International English Language Testing System (IELTS) and provides a rationale for their introduction. Notes that IELTS is widely accepted as a reliable means of assessing whether candidates are ready to study or train in the medium of English. (five references) (Author/CK)

Previous studies of washback (the influence of a test on teaching and learning) have provided insights into the complexity of educational systems and test use, especially in relation to the role of the teacher, but have given insufficient attention to the relationship between observed practices and test design features. In this article a washback…