What should indicate main points in a preparation outline?

In a preparation outline, main points are indicated by Roman numerals. This format is used because it clearly distinguishes the main points from subpoints, helping to create a structured hierarchy in the outline. Roman numerals serve to signify the primary ideas or topics presented in the speech, making it easier for the speaker to follow the flow of content while preparing their presentation.

Using Roman numerals for main points promotes a clear organizational scheme, allowing listeners or readers to easily identify and understand the structure of the argument or narrative being presented. This practice is standard in outline formatting, ensuring consistency and clarity across various presentations and written work.

Other formats, such as lowercase letters, capital letters, or numbers, are typically used for subpoints or further detailing under the main points, which is why they do not serve the same function as Roman numerals in a preparation outline.