There is an article on my website that has some really great information about lying but, in brief, it really isn't about lying at all, it's about TRUST. Yep, TRUST. Once someone lies, you can't trust them any more. We need to teach our kids that trust -- earning it and keeping it -- is super important to their success in life. If they break our trust we need to lovingly guide them toward wanting to rebuild that trust. Sometimes that rebuilding is super painful but with lots of EMPATHY it will be worth the journey.
Website Link:
http://www.parentingwithlogic.com/lying-and-trust.html