To properly focus your topic on a research question, you first need to understand what is known and believed about your topic, in other words, the scholarly consensus on your topic. Begin with reference sources, such as encyclopedia articles, textbooks, surveys in books and articles, informational web sites, and statistics. Make a note of any questions or unresolved issues about the topic. These may make good research question ideas!
For more help using Boolean Searching See the LibGuide Boolean Searching