抄録
Monbusho's guidelines prescribe the number of new words that should be int.roduced in English courses in high school: 400 for English I, 500 for English II and 900 for Reading. Each textbook must be made according to the word number t.o pass Monbusho's screening. However, it does not prescribe which words they are. Therefore. accuracy of the words used in the textbooks has not been discussed. This paper first generates the wordlists with specific rules for accuracy according to the following steps: 1) create the wordlists of all the textbooks using the computer program, WordSmith 3.0 (Oxford); 2) extract the words that are taught in junior high school from the lists; and 3) adopt the high frequency words to meet Monbusho's guidelines. Second, it compares them with the list of wordbook (Zen-eiren) that should be learned in high school. Finally, through the discussion above, it is concluded that prescribing the number of new words in the guidelines is not meaningful and that the words to be learned do not appear enough in the textbooks, which might be one reason for the difficulty of word acquisition for Japanese high school students.
