Once you have done your research, it's time to write up what you learned. Begin by going through your notes and tapes. Write down the most important points you want to make. These should include these basic questions: How big is the problem? How many people are affected? What are the root causes of the problem? What is being done to solve the problem, both in the short and long term? What is not being done? What can the people reading your report do?
Now that you have decided on your main points, it's time to write and put together your report or exposé. Remember, you are presenting a case for change. You must provide evidence that the problem is real and important. There are basically three kinds of evidence you can use. The first are statistics. These are very useful to give an overall picture of the problem. No exposé can do without them.
Of course, statistics can be very dry if they are presented by themselves. This leads to the second kind of evidence: real-life stories. Sometimes the best way to expose a problem is to tell how it affects just one person or family. In general, people can emotionally connect with stories more than numbers. Third, there is nothing like a good photograph. For example, a picture of a homeless person living in a box can speak a thousand words.
Finally, a good exposé provides solutions. You might want to list what needs to be done about the problem at the end of your exposé. Don't forget to tell people how they can help -- by sending money, doing volunteer work, writing political officials, etc. Remember, many people think that these problems only happen to other people. So appeal to your readers' consciences. Remind them that drug abuse or homelessness can strike anyone's family. The expression "there but for the grace of God go I" is something we all need to remember.
Maybe just exposing a problem is not enough for you. Perhaps, you would like to do volunteer work. Most churches and social groups need and want volunteers.
Once you have finished your report, you might want to make copies and pass them around your class, school, or neighborhood.