Although the IELTS speaking test assesses English verbal-communication competence accurately and reliably, its traditional, retroactive scoring framework stops short of providing detailed diagnostic information about individual test-takers' specific domains of proficiency or deficiency. This study employed a cognitive diagnostic assessment (CDA)…

This study used Latent Growth Curve Modeling (LGCM) to examine the overtime patterns of the score and test-taking strategy changes in an international high-stakes standardized proficiency test. To this end, the test records of 178 Iranian IELTS repeaters were analyzed, using close- and open-ended questionnaires to measure test scores as a function…