Once you've found an interesting topic, and you do some preliminary research, you may find that there is too much or too little information to work with.
If you find that there is too much to write about, or more than you need for a short paper, you should consider narrowing your topic. In other words, choosing a more specific topic than one you started with.
For example:
How you can change your search strategy:
On the other hand, you might have to broaden your topic if you find that you're having a hard time finding enough resources to write your paper.
If your assignment requires you to use (or not use) particular types of information sources, it could affect the topics you can write about.
Many of our research databases list subjects in the records for books and articles. This screenshot from the library catalog is for a book called Plastic Soup: An Atlas of Ocean Pollution.
In this case, a librarian has picked these subject terms from a huge list of subjects to describe what the book is about. For articles from a research database, the database producer may have picked the terms, and/or the author of an article may have supplied words that describe its topic.
These subject terms: