Writing an argumentative essay often involves building on an expository essay that you have already written. Given that writing an expository essay is based on objective description, writing an argumentative essay is premised on subjective argumentation in relation to an issue or phenomenon of importance. Keeping with the example of anthropogenic climate change, your professor might first ask you to write an expository essay on humans and climate change, and then, in a subsequent assignment, ask you to write an argumentative essay on climate change. While the purpose of the expository essay is to describe the phenomenon objectively, the purpose of writing an argumentative essay is to defend one position in the debate around the subject.
In writing an argumentative essay, you must provide logical or academically supported reasons for the position that you are arguing in favor or. When you write an argumentative essay, it is thus important that you do not engage in too much description. Engaging in too much description when you write an argumentative essay can lead you to lose a large number of points when your professor grades it. Because the point of an argumentative essay is in fact to argue in favor of one position regarding a specific issue, you should not spend more than 10 percent of your essay, excluding the introduction and the conclusion, engaging in description. Rather, you should only describe technical terms through definitions and provide a brief description of the issue you are taking a position on at the beginning of your argumentative essay.
Ultimately, writing an argumentative essay is a process in which you apply sources and critical thinking to take a position on an issue or argue in favor of an opinion regarding a phenomenon. Critical thinking about the issue, based on logic or secondary sources, is critical for providing a sound opinion on the topic or issue you are writing about. You cannot invent facts or make illogical arguments when you write an argumentative essay. Your professor will be grading your argumentative essay for coherence and this is one of the most important elements of being successful when you write an argumentative essay.