Any correspondence you have with a potential employer provides real-world samples of your professionalism and communication skills. Take the time to write them correctly.

• Cover letters
  Get noticed with an attention-grabbing introductory letter.
  
  
• Advice/referral letters
  Develop solid networking contacts.
  
  
• Recruitment firm letters
  Introduce yourself to recruiters.
  
  
• Thank you letters
  Follow up after interviews or networking meetings.
  
  
• No further interest letters
  As a courtesy, remove yourself from consideration for a position if you are not interested.