open-stack system; open-shelf system
Library term referring to a system where patrons can directly access materials on shelves, as opposed to closed stacks.
This library uses an open-stack system, so patrons can freely pick up books.
The advantage of the open-shelf system is that users can choose materials directly.
Compound of 開架 (open shelves) + 式 (system/style). The term is a modern library-science coinage.