Most large institutions do not want their employees to carry around large quantities of keys. Similarly, these institutions would like to restrict access based on an individual’s standing, and responsibility, within the establishment. A master key system will allow for different levels of restricted entry. When a master key system is finished there may be a graduated level of access. In the example of a property manager, one tenant’s key will work on their lock but not on the neighbor’s lock. However, the property manager will have one key that works for both locks. This can work to create a number of possible keys.