The following question refers to “writing a research paper”: which of the following is a suggestion for narrowing a broad subject to a more specific subject?

search the world wide web for pages or sites containing key words related to your subject.
google your topic and choose the first site listed. the first site is usually the best site.
develop your own ideas on the subject, as your own ideas are usually more original than those of published authors.
read your newspaper for a possible hit on the key word/subject of your choice.