Changing the way you write the different levels is one way of making it clear that you have a hierarchy of information on the page. (The outline in Figure 10-3 has questions for heading level 1 and nouns for heading level 2.)
Another way to signal heading levels is to change the format. You can show different levels of heading with type size or placement
• Type size. If you are using size, always make the level 1 headings bigger than the level 2 headings. People associate size with hierarchy: bigger is more important. Make the difference noticeable - at least 2 points of type size.
• Placement. Instead of changing size, you can indent the second-level or run it in the same line as the text (with the heading part in bold or color). The bold headings for each tip in the Celestial Seasonings example in Figure 10-10 are run-in headings.
Make sure that the headings get larger when the rest of the text gets larger for people who change the type size. You can do that by setting headings to be a percentage of the text type, and not an absolute size.
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