Quantity and quality in speaking test performance

Scores on speaking tests are used as evidence of both learner language ability and the second language acquisition process, and most speaking tests include scoring rubrics to help ensure that ratings are reliable and reflect a theoretical construct of speaking ability. Nevertheless, it may be that similar ratings on a speaking test in fact represent qualitatively different learner performances. Such a situation would mean that interpretations of ability or acquisition process based on such test scores may not be valid. The purpose of this article is to investigate the hypothesis that similar quantitative scores on a speaking test represent qualitatively different performances. The results of the study raise a number of issues for further investigation.