Type with fancy serifs must be avoided. Bold and italic type shoud be used sparingly, and should not be used in long passages. Typefaces that use the largest amount of available space for the character should be selected. Most of us read by patterns as well as by letter. Helvetica, or sans serif lettering, is also easy to read and a font commonly used.
Line Leading Line leading is the space between lines of type.
Print smaller than 11 point has decreased line leading which decreases readability. Large print materials are usually produced with heavy leading, i.e., wide spacing between the letters and lines of print. Proportional type adds white spacing before and after letters to make up the difference in spacing. This extra spacing deters readability. Non-proportional spacing allows for adjustment between letters to eliminate unneeded white spaces and to allow extra space for wider letters.