Negative words: The last main factor is negative words. Although only Subject A did this, it is worth presenting. He tried to look up a word which starts with a negative unit. For example, instead of looking up the word /aojaisai/ (= v. to pay attention to), he looked for /mai-aojaisai/ (mai = no, mai-aojaisai = not to pay attention to), but he was unable to find it.
Subjects were not sure which words to choose
Although this is the second most frequent problem (26.61%), it occurred mostly with Subject B (15 out of 29 times) and it did not occur with Subject A at all. From the think-aloud and the retrospective interview data, it was found that there were two main circumstances connected with this problem.