“Your essay needs to have a defined start, middle and end. The start being the introduction, the middle being the body and the end the conclusion. Remember to organize your ideas logically.

Introduction

The introduction is a very important part of the essay. It introduces the reader to your essay, catches the reader’s attention, and it gives the reader background information about the essay. Don’t hide your main ideas. One mistake writers often make is that they don’t write out all of the main points until the conclusion of the essay. Don’t make that mistake. Instead, tell your reader all that your essay is about and all the main points you are going to cover. Always start with general information … ”

more at http://mr.schoolsuccess.tripod.com/StructureofEssay.html

Economics

Polotics

Economy

Social

There is another one I’m not sure if all those are correct but I hope it helps some.