"Effective business correspondence yields results because it achieves two basic objectives.
First, it conveys a clear and unambiguous message to the reader and second, it produces goodwill in that reader. To achieve these two objectives, the writer must write:
These characteristics are the result of careful planning, writing in plain English, and critical editing."
Dwyer, J. (1993). The Business Communication Handbook , (3 rd ed.). New York: Prentice Hall, p.186.