Heading are used to break up the flow of the text and to organize it in such a manner that a reader can quickly identify key components. Most research reports will have several standard headings (e.g., Method, Results, Discussion, References) and subheadings as needed.
Listed below are several levels of headings and what each looks like. Below that are the rules for when to use what levels of headings.
THIS IS A CENTERED UPPERCASE HEADING (LEVEL 5)
This is a Centered Upper- and Lowercase Heading (Level 1)
This is a Centered, Italicized, Uppercase and Lowercase Heading (Level 2)
This is an Uppercase and Lowercase Side Heading (Level 3)
This is a paragraph heading (level 4). The paragraph heading is in lowercase (except for the first letter), is in italics, and should end with a period as shown.
Traditionally, the Method, Results, and Discussion headings are at Level 1.