Commitments are a crucial part of being successful in . every aspect of life.  Whether it be a personal or business commitment, following through is expected, no matter what the results are. Hopefully the outcome will be a positive one where everyone involved is happy and satisfied.  If the results aren't what you hoped for, it is still critical to complete the promise made and then study what mistakes, if any, were made in the process.  The most important thing is that the commitment was fullfilled. Read more about the importance of following through with your commitments from the Entrepreneur.

http://www.startupbooster.com/2009/12/29/entrepreneur-why-you-should-follow-through-with-your-commitments/