Hua DONG,Tongji University Purpose of a literature review(3) To gain feedback information in order to rethink and focus a research topic.This concerns sorting out key issues,identifying 'hot' research topics and using your literature review to assist you in formulating or refining your core research question. Purpose of a literature review (3) To gain feedback information in order to rethink and focus a research topic. This concerns sorting out key issues, identifying ‘hot’ research topics and using your literature review to assist you in formulating or refining your core research question. ©Hua DONG, Tongji University