HRCSB expects a recommendation for an Access Control System (ACS) that is specific to location/building/room function, facility and door type. Any recommended system components should provide HRCSB with maximum flexibility for expansion now and in the future. The components should be upgrade-able and swappable without requiring mass replacement of all components or fragmented system control. The system components should be open protocol. Cards or other keying devices should offer maximum flexibility, ease of use and access management for users and system administrators. Electronic door locking components (such as card readers) should be durable, exchangeable without causing system fragmentation, failures partial or otherwise, and agnostic to other system components such as card or fobs, program software and key-ways.