This study explores the extent to which topic and background knowledge of topic affect spoken performance in a high-stakes speaking test. It is argued that evidence of a substantial influence may introduce construct-irrelevant variance and undermine test fairness. Data were collected from 81 non-native speakers of English who performed on 10…

Alderson (2005) suggests that diagnostic tests should identify strengths and weaknesses in learners' use of language and focus on specific elements rather than global abilities. However, rating scales used in performance assessment have been repeatedly criticized for being imprecise and therefore often resulting in holistic marking by raters…

This study explores the utility of analytic scoring for TAST in providing useful and reliable diagnostic information for operational use in three aspects of candidates' performance: delivery, language use and topic development. One hundred and forty examinees' responses to six TAST tasks were scored analytically on these three aspects of speech. G…