Broad Topic: Global warming
Narrower Topic: How will climate change impact sea levels and the coastal United States?
Narrow Topic: Does cartoon viewing cause violent behaviors in children under the age of five?
Broader Topic: What are the negative effects of television viewing on children and adolescents?

Your thesis statement is a road map for your paper telling the reader what to expect from the rest of the paper. As you write your paper, make sure you are not wandering from your thesis statement. Do you need to modify your working thesis? Your keywords will help you locate resources to support your thesis.
If you are not finding enough information, your topic may be too narrow. Consider broadening it by:
This handout illustrates how a research question develops from a broad topic to a focused question.
A thesis is typically a one-sentence statement in the first paragraph, or beginning, of your project that states your purpose. Thesis statements should be arguable, specific, detailed, and meaningful.
Additional resources for help in developing a thesis statement:
Developing a strong thesis statement - Purdue OWL
Narrowing a topic requires you to be more specific about your research interest and can help you to develop a thesis.
Questions to Narrow Your Topic