Clarity: Make sure your message is clear and easy to understand.
2. Conciseness: Keep your letter short and to the point.
3. Courtesy: Use polite language and a respectful tone.
4. Correctness: Check your grammar, spelling, and punctuation for accuracy.
5. Completeness: Include all relevant information.
6. Concreteness: Use specific details and examples to support your points.
7. Consideration: Think about the needs and interests of your reader.