Have a look at this italki Knowledge page for an example of a discursive essay http://www.italki.com/knowledge/page/Discursive%5B%20argumentative%5D%20Essays.htm

A discursive essay is an essay about a controversial topic. In this type of essay the author chooses a topic and presents both sides of the opinions and favors one side. These types of essays help to learn how to logically structure an argument and counter the arguments of others, like a debate.. To write a good essay you must follow a strict structure. You should create a plan first and then follow it to develop your essay. Essay Structure: Introduction Your essay must begin with proper introduction to the topic. If possible, provide both side’s point of view, yours and the opposite in the beginning to create balance in the essay. This will also help in building the interest of the reader. Main body of your essay [ 3-4 paragraphs] The body of your essay should also be divided into several paragraphs for easy reading. Use separate paragraphs to put forward the negative and positive points. Your strongest argument must occur in the second paragraph. You must strengthen it with expert opinions, real world examples and statistical data. In subsequent paragraphs in discursive essays put forward the arguments in descending order of importance. Always write new thoughts in separate paragraphs. You can cite examples also to substantiate the opinions. Conclusion The essay must conclude with a summary/conclusion. Do not introduce any new information in this part. The summary should be based on the job you have done in the essay. Do not be prejudiced and make your position clear. Give tribute to both sides of the opinion. If you can give prediction for the future of your topic, then it will add value to your essay.