Take a moment and read this insightful article by Steve Saint on this important topic.
An excellent book on this topic is When Helping Hurts which should be a must read for all mission committees. In addition, I have a blog post titled When Money Hurts Mission Efforts.
Not all that looks like poverty is truly poverty. Sometimes it is our own definitions, not reality. One can be rich in many ways without being wealthy and much of what passes as wealth in the west is truly poverty of life and spirit.