from Purdue OWL - Writing Resourcces - http://owl.english.purdue.edu/handouts/general/gl_thesis.html

Argumentative Thesis Statements

In an argumentative paper, you are making a claim about a topic and justifying this claim with reasons and evidence. This claim could be an opinion, a policy proposal, an evaluation, a cause-and-effect statement, or an interpretation. However, this claim must be a statement that people could possibly disagree with, because the goal of your paper is to convince your audience that your claim is true based on your presentation of your reasons and evidence. An argumentative thesis statement will tell your audience:

Example: Barn owls' nests should not be eliminated from barns because barn owls help farmers by eliminating insect and rodent pests.

A reader who encountered this thesis would expect to be presented with an argument and evidence that farmers should not get rid of barn owls when they find them nesting in their barns.

Questions to ask yourself when writing an argumentative thesis statement:

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