About ASCAA (from their website):
The American Society of Certified Auto Appraisers is the only organization dedicated solely to the Auto Appraising Industry. Their goal is to make sure all auto appraisals in America adhere to the Society's standards, ethics, quality and methodology.
ASCAA certified appraisers are experts. The meticulous ASCAA certification process ensures that ASCAA-certified appraisers are accurate, impartial and credible. They are educated and experienced in the field and are respected members of their communities. Most importantly, they deliver independent valuations that assure automobiles are appraised at its fair market value.