A closing argument is delivered by an attorney at the end of a trial, after all of the evidence has been presented, witnesses and experts have been questioned, and the theory behind a prosecution or a defense has been given. A closing argument is the last chance an attorney has to address the judge and jury.. Write an outline. An outline for the closing argument will serve as a script, or a guide to follow while speaking to the jury. This will help you feel more organized, and will minimize the risk of forgetting key facts.