Canards not only help with avoiding stalls by acting as a lifting surface on the front of the aircraft but they also allow for greater and slower maneuverability. For slow, high AOA flight canards make all the difference. They work in conjunction with the elevons of a delta. Elevons go up to change pitch axis canards go down. They move together and are not coupled with the roll. Some people have coupled them with the roll and most moved them back to pitch axis only, just B/C on our models that is very hard to make fly right.

Hope this helps

Dave