Medical education
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This study aimed to compare an essay-style undergraduate medical assessment with modified essay, multiple-choice question (MCQ) and objective structured clinical examination (OSCE) undergraduate medical assessments in predicting students' clinical performance (predictive validity), and to determine the relative contributions of the written (modified essay and MCQ) assessment and OSCE to predictive validity. ⋯ Using more comprehensive, more reliable and more authentic undergraduate assessment methods substantially increases predictive validity.