NAUI does not participate because NAUI is a membership driven agency. So, cannot have an outside organization going against the vote. NAUI simply or meets, or in most cases exceeds all RSTC recommendations.
Jeff
NAUI has been invited a few times in the past but refuses to be a part of the RSTC because they feel the standards of the RSTC are too low. That's the main reason. NAUI used to have a document about this on their website but I'm having trouble finding it right now.
I'm not aware of any voting that members can do regarding standards or procedures. As members we can vote for other members to be on the board of directors and other positions but we don't have direct say in S&P.