Hi, thanks for everybody's advices. I am not a native speaker. In fact, the dissertation is an independent work, hence, supervisor will not give me too many advices. Supervisor's responsibility is ensure your survey questions are ethical. If you guys really could not understand the questions on the questionnair, that's my fault. However, if you can answer the most of qustions as you can, it is still useful to me. Thank you everybody here. Josh Tseng