Construct Validation of TOEFL-iBT (as a Conventional Test) and IELTS (as a Task-based Test) among Iranian EFL Test-takers’ Performance on Speaking Modules

Abstract

The aim of the present research is to examine the construct validation of the speaking sections of two internationally known language proficiency examinations, namely IELTS and TOEFL iBT. IELTS (International English Language Testing System) and TOEFL iBT (Test of English as a Foreign Language, Internet-based Test) are two common examples of high-stake standardized tests which play a critical role in determining the future life of their candidates. This research seeks to scrutinize how IELTS and TOEFL iBT tap the same construct validity on the speaking proficiency of their candidates and moreover about the similarity of results for both IELTS and the TOEFL speaking tests. Participant in this study were 30 EFL students at high level of education in Khuzestan. Finding reveal that the IELTS and the TOEFL speaking tests share both differences and mostly similarities in terms of measuring a candidates' speaking ability. Different analyses yielded highly similar results: two tests are significantly correlated, classification of agreement between test-taker 'performance on both speaking test was very close. The study considers both the theoretical and practical implications of these findings for Iranian stakeholders in particular and for test users in general.