This study investigated the following two research questions: 1) Would a new set of 600-score level CDs based on teachers' intuitions as to its potential for creating effective TOEIC learning materials correspond with the beliefs of students, who had received 600 level TOEIC scores, about their own English can-do abilities? 2) Would there be improvements in the scores of students who used TOEIC learning materials developed from this study's CDS?