Labels can appear in two prominent places: first, within the main body of the outline, where each section and subsection is labeled with Roman numerals, letters, or numbers to indicate the hierarchy of ideas. These labels help organize and structure the content, providing a clear visual guide for the essay's development. Second, labels are also commonly used in the header or title section of the outline, where the title of the essay and additional identifying information, such as the author's name or date, are labeled for clarity. Both instances of labeling contribute to the overall organization and coherence of the preparation outline.