The final paragraph of your essay is where you will summarize your argument and present the reader with your ultimate conclusion. The standard format for an essay's conclusion is to restate the thesis, and then concisely demonstrate how your supporting points have proven your original assertion. It is important that the conclusion of your essay be strong and definitive. In the end, you want to present your reader with a coherent and concise essay that demonstrates your knowledge of the topic at hand, and your ability to reason and argue clearly and with precision.
A Note About Formatting: Outlines usually follow a specific format using parallelism, Roman Numerals, upper case letters, and sometimes numbers to indicate ideas with different levels of importance. Unless your instructor is planning to collect and grade your outline based on proper formatting, try not to get too hung up on making sure that you're formatting each section properly. The important thing to remember is that the outline is meant to be a helpful organizational tool --compose your outline in such a way that it will be helpful to you !