A usage-based approach to understanding L2 learners' knowledge of English affixes

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As per our original plan, thus far we have successfully confirmed the selection of derivations, coded them for the affixes they contain, developed vocabulary test items testing knowledge of these derivations and the various affixes they contain, and piloted the items.However, we are still in the process of collecting data by administering tests to students. To date we have tested 70 of the planned 130 students on the full 1000 items, and plan to test another 60 by the end of the academic year. In addition, 70 other students have completed at least one of four subsets of items (170 items each). At least another 70 more students should complete these subsets by the end of October. We will equate this data with the sample of 130 students who took all 1000 items using item response theory.