ClusteringClustering is another way of brainstorming. With this method, you place your main idea in a circle and then put other ideas around it. For example, if you were writing a paper about growing up, you could write the phrase "growing pains," and circle it. You could then write words all around it as fast as you think of them, even if the ideas seem random. Circle each word as you write. Then connect your word to others with lines.