There should be more space between paragraphs than between lines. 13 Headings Headings should be clearly differentiated from the main text using some combination of size, weight and space. Capitals should not be used for headings, nor should out-denting. A second typeface such as a sans serif in contrast to a serif body text could be used, but no research has been carried out to prove its effectiveness. Headings in bold are clear as long as there is plenty of contrast between the weight of the heading and that of the text.
Headings seem easiest to read when ranged left with the text.
It has not been established whether centred headings are harder to read than ranged left ones, though common sense suggests that they are. Extra space around headings may be enough to differentiate them from main text. In the past, documents for visually impaired readers often used underlined headings. There is no conclusive evidence that this assists readability. 14 Design and layout Layouts should be simple and clear with recognisable patterns for levels of heading, numbering systems, and treatment of specific information.