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This dissertation study aimed, first and foremost, to address the current scarcity of assessments of productive and contextualized academic vocabulary in English, and thus contribute to the Applied Linguistics and Language Assessment field, by developing what seems to be the first IRT-based computer-adaptive test of productive and contextualized breadth of academic vocabulary in English (henceforth, CAT-PAV), which will be made freely available online to any researchers, ESL instructors, or other interested parties who believe the test can potentially be useful for their specific scenarios. A second aim of the present study was to validate the interpretation of scores from the CAT-PAV and their use for two specific scenarios at Iowa State University (ISU): as a diagnostic tool, or as an ESL placement aid for Iowa State’s English Placement Test (EPT). The development of the CAT-PAV was informed by evidence-centered design (Mislevy & Riconscente, 2006), a test development framework that allows for a close alignment of test development decisions with interpretations of precisely what is being measured. The validation of the intended interpretation and specific uses of the CAT-PAV presented here, in turn, was informed by an argument-based approach to validation (Chapelle, Enright, Jamieson, 2008; Kane, 2013), which specifies through an interpretive argument a chain of inferences for the interpretation and uses of test scores, along with a detailed and explicit definition of what kind of support is required for each of those inferences to be warranted in a subsequent validity argument. Five inferences were employed in the validation of the interpretation and uses of CAT-PAV scores: Domain Description, Evaluation, Generalization, Explanation, and finally, Utilization. Analysis of the extent to which each of the five inferences could be supported was based primarily on the responses of over 900 test takers (which included ESL instructors) to test items and preand post-test questionnaires, collected over a period of four months.

A computer-adaptive test of productive and contextualized academic vocabulary breadth in English (CAT-PAV): Development and validation