Your conclusion being the last part in any presentation, should be convincing; it relates to your topic paragraph by summarizing the main points for the audience, restating your thesis statement with the evidence but wrapping it up; and contrary to the introduction, it should begin specific and move to the general, getting the main idea from each paragraph and resolving the questions for the audience.
The conclusion must restate the thesis -- which was stated in the introductory paragraph. Think of the introduction and the conclusion as the two slices of bread of a sandwich.
