| A | B |
| memo | interoffice communication |
| e-mail | communication by computer |
| business letter | formal correspondence by mail |
| personal note | informal interoffice communication |
| reference | credit given for an outside source of information |
| title | formal heading on a centered problem, a numbered list, a report |
| quad space | three blank lines |
| double space | leaves one blank line |
| single space | leaves no blank lines |
| copy | where typed information comes from |