Developing persuasive writing skills is a process that students start in elementary school and continue to develop through high school and beyond. Read Write Think offers a good interactive guide that can help students craft a good persuasive essay. The Persuasion Map
asks students to start with a thesis statement before walking them through developing support for that thesis. Students can print their persuasion maps or email them to you.
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Using Read Write Think's Persuasion Map
won't replace the need for your instruction, but it could be helpful to students who need a little assistance after your lesson. RWT offers a number of lesson plans that incorporate the Persuasion Map. You can find those lessons here