Summarize the main argument of your paper without repeating too much. Point out why the argument is significant to the research and issue at hand to bring them to a concluding point.
Explain the strengths and limitations of your research and arguments to suggest what future work is required.
Explain the importance of your work and the significance it has to the real world. Answer the question: "How are my arguments and research useful?"
Demonstrate how all the ideas and research you put forth in the paper work together without having to present new information.
Echo the introduction without repeating it word for word to tie the paper together neatly. Explain how the insights and information found in the body of the paper reinforce the ideas suggested by the thesis in the introduction.
End the conclusion with something you want your readers to think about by issuing a challenge to your readers pertaining to how the information presented in the paper can influence their lives.