Pass systems are security control mechanisms used to manage access to restricted or sensitive areas within a facility. The common types of pass systems include:

Single Pass System: A permanent pass assigned to the user, typically used throughout employment unless access levels change.

Multiple Pass System: Involves multiple types of passes for different access levels or time periods.

Pass-Exchange System: A system requiring the surrender or exchange of one pass for another at checkpoints or entry to more restricted areas.

"Pass-control system" is not recognized as a distinct type of pass system in security literature and is not classified within the known categories defined in the ASIS Protection of Assets (POA) Manual or PSP certification materials.