1. Be Sure to "Discuss"Be sure to read the question carefully. The common application is not asking you to "describe" or "summarize" an issue. So, if the bulk of your essay is describing the terrible conditions in Darfur, you are not answering the question. To "discuss" something you need to think critically and write analytically.
2. Focusing Close to Home is Often BetterThe admissions office gets lots of essays on big, newsworthy issues like the war in Iraq, the fight against terror and U.S. dependence on fossil fuels. In truth, however, these giant and complex issues often don't impact our immediate lives as much as more local and personal issues. Since colleges want to get to know you through your essay, be sure to focus on an issue that will actually teach them something about you.
3. Don't Lecture Your AudienceThe admissions officers don't want to be lectured on the evils on global warming or the cons on world trade. Save that writing for a paper in your college Political Science class. The heart of an essay on option #2 needs to be about you, so make sure your writing is as much personal as it is political.
4. Give Emphasis to "The Importance to You"The end of the prompt for option #2 asks you to discuss the issue's "importance to you." Don't short change this essential part of the question. Whatever issue you discuss, you want to make sure that it truly is important to you and that your essay reveals why it is important to you. A good essay on this option reveals the person behind the writing.
5. Show Why You'd Be a Good Choice for the CollegeTrust me -- the common application doesn't include option #2 because colleges want to learn about world issues. Colleges want to learn about you, and they want to see evidence that you will add value to the campus community. The essay is really the only place in the application where you can highlight your convictions and personality. As you discuss an issue, make sure you reveal yourself to be the type of thoughtful, introspective, passionate and generous person who will make an ideal campus citizen.