A thesis is the main point or argument of an information source. (Many, but not all, writing assignments, require a thesis.) Thesis are often answer your research question. Note that it does not have to be the only answer to your research question, a strong thesis question gives a reasonable answer. Below are some characteristics of a strong thesis.
A strong thesis is:
Reading previous research is vital to developing a strong thesis. By reading what others have to say about, you'll learn what interests you, and develop interesting questions with interesting answers. Exploring broadly can help you refine your central point.
A strong thesis is specific and unique, so you first need knowledge of the general research topic. Background research will help you narrow your research focus by answering the obvious questions with established answers; it will also help contextualize your argument in relation to other research.
Ask questions as you review sources:
Before committing yourself to a single viewpoint, formulate a specific question to explore. Consider different perspectives on the issue, and find sources that represent these varying views. Reflect on strengths and weaknesses in the sources' arguments. Consider sources that challenge these viewpoints.
Example: What role does and should the U.S. government play in regulating carbon emissions?
Is the topic:
Your thesis will probably evolve as you gather sources and ideas. If your research focus changes, you may need to re-evaluate your search strategy and to conduct additional research. This is usually a good sign of the careful thought you are putting into your work!
Example: Because climate change, which is exacerbated by high carbon emissions, adversely affects almost all citizens, the U.S. government has the responsibility to help reduce carbon emissions through public policy and regulation.