An argumentative essay presents evidence to support an idea. For example, you might write an essay arguing that school's should not give homework. You would do research exploring the benefits of no homework. Though you will be taking a side on the issue, you would also acknowledge the opposing side.
The important concept of an argumentative essay is that all information presented be supported by facts and evidence. You structure your writing so that it includes claims that are supported by reasons that are backed by evidence.
Collect evidence that allows you to think though both sides of the argument.
Rehearse by explaining your position and listing your reasons point by point. Organize your information in a way that makes sense to you.
Plan your claim and reasons into boxes and bullets structure. The Box and Bullet Method is a simple note taking strategy.
Use evidence to support your claim.