Concrete descriptive details. Like photographs, vivid words can bring a moving immediacy to any argument. A student may amass facts and figures, including diagrams and maps, to illustrate the problem of wheelchair access to the library. But only when the student asks a friend who uses a wheelchair to accompany her to the library does the student writer discover the concrete details necessary to move readers. The student can then write, “Marie inched her heavy wheelchair up the steep entrance ramp, her arms straining, her face pinched with the sheer effort.”