This book examines how corpora and corpus linguistics techniques can be used to identify and improve problematic questions in multiple choice English language tests aimed at Japanese students. Three types of problematic test questions were identified in a corpus of such test questions 1) those which had distractors which were not congruent with learners' actual errors 2) those with repeatedly used stems that were not frequent in English 3) those which had more than one possible correct answer. I identified ten representative questions of each type and attempted to improve them by using...