As for judging whether what is procured really reflects the general situation, you have to rely on even more interviews and refer to other materials, such as research reports, statistics and the results of questionnaires.
至於要判斷得來的資料是否反應一般狀況，則有賴更大量的訪問和參照其他資料，如研究報告、統計數字及問卷調查結果等。