Many people think that the ACL "resource" and "privilege" are the same as the controller and the action.
This is not true!
The resource in Zend_Acl can be anything - a controller, a file, a model, etc
The privilege, just like the resource, can be anything related to the resource for example,
it could be an action if the resource is a controller, or it could be "read" or "write" if it's a file or a model.