Sp it isn't about trust. It is about trustworthy systems. If you want to trust the people hand them your wallet and ask for it back in two days. If you want to trust your system apply reasonable checks and balances as John just suggested.
I disagree with John on the point that a major function of a Service Advisors job is to sell labor hours. Obviously off topic, but needs to be addressed. Service Advisors sell "solutions to problems" and "problem prevention" (maintenance). They do not sell hours. If so try collecting one, or better yet go spend an hour in Walmart...see what you leave with.
Their job is:
Time Get the vehicle for as long as possible.
Smiles Make the customer smile during the process.
Dollars Get the customer to authorize the required amount of money.
If they do this then the downstream processes can function including those of production, cashiering, and accounting, etc..
[This message has been edited by TheOne (edited 06-25-2009).]