Ben Dean, writing on the University of Pennsylvania’s Authentic Happiness site offers some ideas to encourage integrity:

“The following exercises were adapted from a list compiled by Psychologist Jonathan Haidt at the University of Virginia.

• Refrain from telling small, white lies to friends (including insincere compliments). If you do tell one, admit it and apologize right away.
• Monitor yourself and make a list of every time you tell a lie, even if it’s a small one.  Try to make your daily list shorter every day.
• At the end of each day, identify those instances in which you were attempting to impress others or appear to be someone you are not.  Resolve not to do it again.”