There are dozens of personality trait assessments on the market. I highly recommend you check out some form of the D-I-S-C version. It’s simple, easy to learn, easy to remember, and incredibly helpful in dealing with people—donors, staff, even family.
My favorite provider of DiSC assessments is Personality Insights at http://www.personality-insights.com. They make learning this format fun! Go to their store and look in the “profile” section for the “Adult Profile Assessment.” For about $10, you can get your own self-scoring DiSC assessment.
This is a great tool for teams and boards too.