The present article gives an overview of several studies on the predictive validity of the C-test. In the first part of the article, we discuss the construct validity of this test format. Only if the underlying construct of this test is understood, can a justification for high predictive validity be made. In the second part, we discuss several…

As a high-stakes standardized test, IELTS is expected to have comparable forms of test papers so that test takers from different test administration on different dates receive comparable test scores. Therefore, this study examined the text difficulty and task characteristics of four parallel academic IELTS reading tests to reveal to what extent…

This study explored the role of vocabulary breadth and depth in second language learners' performance in IELTS academic reading tests in China. Sixty-two Chinese learners of English as a foreign language completed a vocabulary size test, a vocabulary depth test, and an IELTS reading test. Results showed that vocabulary breadth and depth both…

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…

An English placement test (PT) is an essential component of any foundation program. It helps place students into their suitable language proficiency level so that they do not spend time learning materials below or above their levels. It also helps teachers to prepare teaching materials to students of similar levels (Brown, 2004; Illinois, 2012).…

This paper reports on a study conducted to determine if comparisons between scores on the Test of English as a Foreign Language (TOEFL) and the International English Language Testing Service (IELTS) are justifiable. The test scores of 216 Iranian graduate students who took the TOEFL and IELTS, as well as the Iranian Ministry of Culture and Higher…