After years of teaching, reading, and discussion, English teachers everywhere have found these five basic necessities for a successful essay:
1. A thesis statement—a clear and direct statement of a point of view to be defended;
2. A structure of development that includes an introductory paragraph, a set of support paragraphs, and a concluding paragraph;
3. A clear and logical statement of evidence for each support paragraph;
4. A closing final paragraph that concludes with a closing summation that is a restatement of the thesis statement;
5. Conformity with standard formal grammar—sentence structure, agreement of tense, number, etc.
These five elements are the necessities; an essay that effectively argues its point will excel in each of these areas—strong, interesting, unusual thesis; argued with convincing evidence, statistics, authoritative quotations, etc.; full use of a rich vocabulary, including connotation, sophisticated sentence structure with subordinate clauses, expressive modifiers, etc.; and a brilliant rephrasing of the thesis in the final paragraph.
I think wordprof got it, but are you referring to introduction paragraph, body paragraph one, body paragraph two, body paragraph three, closing? Those are five essential parts to a pursuasive essay.