In the following step, the differences among the three vocabularies were observed from the standpoint of vocabulary level. First, the authors measured the overall vocabulary level of the targeted business-oriented vocabularies by using the BNC HFWL as a scale. The results are shown in Figure 1. The vertical bars on the graph indicate the number of words from the BNC HFWL which are needed to cover 95 percent of each text collected in this study. For example, considering the five TOEIC practice tests, 3,714 words on average are required from the BNC HFWL in order to comprehend 95 percent of the words used in each test. The levels of fifty-eight BNC business dialogues, five TOEIC tests, and six Business Eigo texts were
averaged together for exhibition on the graph.