Use a professional tone
Address the letter to the correct person if possible
State your relationship to the person
Mention how long you have known them
Explain in what capacity you worked with them
Highlight their key strengths
Include specific examples of their skills or achievements
Describe their character and work ethic
Compare them favorably when appropriate
Keep the letter honest and accurate
Avoid vague or overly general statements
Focus on qualities relevant to the opportunity
Use clear and concise language
End with a strong recommendation if appropriate
Provide your contact information
Proofread for grammar and spelling errors