The spacing between text lines is called leading. Adequate space between lines of continuous type improves readability by creating the horizontal flow necessary for easy reading. If the leading between lines is too tight or too loose, readability is impaired. Leading should remain consistent throughout the document. Never set body copy in all capital letters or in script, Old English or novelty types.
Words set in upper and lower case have a more distinctive outline and are easier to read.
When emphasis is needed in the text, use bold or italic type. Never use underlining. Unjustified type adds visual interest to the page, but it is important to ensure that a pleasing ragged right edge is created. This can be achieved by specifying a maximum and minimum line length. Widows should be caught during proofreading and removed through editing.