This is necessary to show readers the argument you plan on presenting to your audience. Your introduction should show your personal connection and/or interest in your topic, the argument you are presenting in the paper, and give your reasoning for why you believe what you do. (Remember from the lectures in Unit 1 that your thesis statement should be an explicit one - that is, tell us your claim and 3 reasons that support the claim. A strong thesis statement is critical to a successful argumentative paper, and if you have that in place now, you will find the structure of the paper will progress smoothly).
My topic is physician assisted suicide. I chose this topic because of my major. I am having issues coming up with a thesis statement that is pro-physician suicide.