AKA the thesis of your speech.
- Summarizes the speech.
- Guides the audience in their understanding of the speech.
- Is a complete declarative sentence.
- Uses direct, specific language.
- Is a single idea.
- Is an audience-centered idea.
Check out this power point about developing your central idea:
http://www.wisc-online.com/objects/ViewObject.aspx?ID=SPH3001.
At the end there is a quiz to see if you understand how to create a central idea.