Subject lines
Once you have determined your purpose in writing the correspondence and drafted your main message, you can write your subject line. Formal and informal letters do not include subject lines; memos and emails do. The subject line is particularly important for email. Many readers scan subject lines to determine how quickly they should read and respond to a message, and rely on subject lines for accurate filing and retrieval of messages. Subject lines that are too vague are frustrating for readers, and may even be ignored.
Practice: Memo and email subject lines
Look once more at the five correspondence scenarios we have been working with. This time, write an appropriate subject line for each piece of correspondence. When you have done so, compare your responses to our suggestions. Remember, your responses will likely not be identical.