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A Group is a collection of subjects.  An example of using a group without using authorization is an email list.  A Role is a collection of privileges that is shared by all subjects assigned to the role, which generally describes the subjects' affiliation, job function, or responsibility.  A Resource is the part of the system which needs to be protected by authorization, and it represents a noun in a privilege assignment.  The Action is the verb of the privilege assignment which allows a resource to be assigned to a subject in various ways without creating more resources .  For example SubjectA can view (action) the Math department data (resource).  A Privilege Assignment associates the subject with the actions and resources that they are allowed to perform.  A Limit is a condition on the privilege assignment which must be true at run-time for the privilege assignment to be allow.  Examples of limits are time of day, source IP address, amounts of approvals, etc.

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