Firstly,
few studies were conducted on the vocabulary of spoken business communications and
“Business Eigo” texts. Secondly, there are two useful means to assess the vocabulary level of
a targeted text. Method number one is to calculate the percentage of coverage of vocabulary
learned through targeted texts. Method number two is to assess the vocabulary level of each
targeted text by calculating the number of words from the BNC HFWL that equals 95 percent
coverage of that text. Finally, in order to acquire each specialized vocabulary, we can utilize
statistical measures such as LLR and MI in addition to the conventional criteria, such as
frequency and range.