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Data collection instruments used in Chang (2019, "Language change and linguistic inquiry in a world of multicompetence: Sustained phonetic drift and its implications for behavioral linguistic research", Journal of Phonetics), which are shareable publicly according to the study's IRB protocol: (1) the initial Language Background Questionnaire (administered in the first week of the production study), (2) the Exit Questionnaire (administered in the sixth week of the production study), and (3) the Year-End Questionnaire (administered in the final study session, i.e. week 52). The questionnaires are minimally edited to preserve the privacy of the language program. The list of linguistic stimuli used in the elicited production task is provided in the journal article.
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