Effective business writing contains five characteristics, which can be summed up in the Five C's, i.e. 1) Correctness; 2) Clearness; 3) Completeness; 4) Conciseness and 5) Courteousness.
Correctness means using standard grammar and spelling. It means choosing suitable stationary and a format acceptable for the situation. It means avoiding obvious erasures or corrections.
Clearness is the keynote of the other four characteristics. A business message must be clear so that it will be understood the first time it is read.
Completeness refers to providing enough information so that the intent of the message is understood by the reader.
Conciseness is the soul of business writing. To make your message as concise as possible, you must:
（1.）get to the heart of the message immediately and stick to the point.
（2.）avoid phrases that say nothing, such as “I think”, “I feel” and “I believe”.
（3.）use simpler constructions to save the reader's time. Use a word instead of a phrase and a phrase instead of a clause for the same thing.
Courteousness
People respond positively to those who treat them with respect and kindness. Nothing can take the place of words like “please” and “thank you”.