I. Detail that the Harrison–Ruzzo–Ullman (HRU) model defines a method to allow changes to access rights and the addition and removal of subjects and objects.
II. Contrast and emphasize that the Bell–LaPadula model does not allow changes, whereas this model does.
III. Categorize the set of four generic rights and special set of commands that make up this model:
• Create subject/create object
• Enter specific command or generic right into a subject or object
• Delete specific command or generic right from a subject or object
• Destroy subject/destroy object