An effective master key system starts by understanding the size and complexity of the access and permission levels needed. All the different entry and exit points across a site that need keyed locks must be accounted for, and then a security hierarchy created to establish who has access to which areas. And remember, it’s just as critical to determine access restrictions as access permissions.Future proofing for expansion should also be considered. Master key systems are popular choices due to their convenience, affordability and because they offer an easy, scalable solution for a site. The chosen systems need to be flexible enough to incorporate potential extensions, so that additional user groups can be easily added.It’s also important to keep a record of who keys have been issued to, as well as details such as who is responsible for establishing any new access permissions.