All rights reserved. For most publications, limit heading levels to no more than three per camera-ready page. You can visualize these levels as lines in a standard outline, with each subsequent level placed farther from the margin. Use the same character formatting and position for every heading at the same level. When your text contains extensive bold copy, look for an alternative.
Italic letters tend to slow reading.
Sometimes this presents an advantage. Use all caps for only very short headings. Although less often used in headings, small caps offer an option that consumes less space than all caps do. In addition to or in place of these formats, you can also vary type size, font, and color to make headings stand out. Position is based on aesthetics and influenced by the balance of text on a page.