How to Win Friends and Influence People! - Dale Carnegie

• Don't criticize, condemn, or complain.
• Give honest,sincere appreciation.
• Arouse in the other person an eager want.
• Become genuinely interested in other people.
• Make the other person feel important - and do it sincerly.
• Show respect for the other person's opinions. Never say "you are wrong".
• Begin in a friendly way.
• Get the other person saying "yes yes" immediately.
• Let the other person feel that the idea is his or hers.
• Appeal to the nobler motives.
• Call attention to people's mistakes indirectly.
• Talk about your own mistakes before criticising the other person.
• Ask questions instead of giving direct orders.
• Let the other person save face.