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At this point, you can use bullet points or a numbering system. You just need to figure out what order you want your paragraphs in to maximize the letter's persuasiveness. For example, you could write an introductory paragraph, followed by a paragraph outlining the pros, a paragraph outlining the cons, and a conclusion paragraph. If you have more pros than cons, devote 2 paragraphs to the pros and whatever reasoning you have for supporting them. For example, you could write 1 paragraph describing the issue of cell phone use in cars and follow it up with an impassioned paragraph describing all of the pros and your reasons for supporting them. Next, write a paragraph describing the cons and your arguments for refuting them. Finally, conclude the letter with a call for action. You can place this sentence at the end of your opening paragraph if you like. To write a persuasive thesis, simply state your argument. This will let your readers know exactly what you're trying to persuade them of. It's important to do this in a persuasive letter, so you're not just rattling off a bunch of pros and cons. For example, you could write something like: "Marine animals should not be captured for scientific studies since it's unethical to perform experiments on living creatures." This type of straightforward beginning will let your readers know exactly what you plan to persuade them of. You could also include supporting quotations. Do some research before you come up with reasons supporting your arguments, and incorporate this research into the finished product. Using data and quotes will let your readers know that you're not pulling ideas out of thin air, but that you're trying to convince them of sound and proven ideas. For example, if you're writing about the need for legislation against texting and driving, write something like, "A poll by the Pew Research Center suggests that over 75% of current drivers text while driving and plan to continue. This statistic is staggering, and indicates how badly we as a country are in need of a solution." A great way to persuade someone is by telling them about a personal experience. Your anecdote could be lightly humorous or poignant and touching but should largely address the issue your letter focuses on. Adding an emotional appeal is a great way to boost the persuasiveness of a letter. For example, if you're writing about the issue of marine animal testing, write something like, "Dozens of animals are confused and in pain every day all because some unethical companies feel the need to unnecessarily test out products. I know because I once visited an animal testing center and was shocked by the unethical animal treatment that I observed." for errors once you've finished writing. Read through the letter and correct any grammatical mistakes. Also, improve any awkward wording, and tighten up your arguments where you spot a flaw. If you have the time, try reading your letter out loud to yourself or someone else. This can help you catch errors or grammatical oddities that you wouldn't have noticed otherwise. If you've written the letter for a school assignment, you're ready to turn it in. Or, if you're using the letter to influence policy, look up the address of the person you're sending it to, then drop the letter in the mail!

Summary:
Outline the paragraph layout of your letter. Convey the letter's topic and your stance on it in a thesis sentence. Include supportive statistics to add a persuasive research component. Add an anecdote to give your letter a personal touch. Proofread your letter