Take a look at this entry from our Supervisor FAQ (Frequently Asked Questions, a sticky at the top of the Supervisor Forum):
How are rights granted if a user is in multiple groups?
Anita Craig 
(BOB member since 2002-06-17)
Take a look at this entry from our Supervisor FAQ (Frequently Asked Questions, a sticky at the top of the Supervisor Forum):
How are rights granted if a user is in multiple groups?
Anita Craig (BOB member since 2002-06-17)