Besides the classical automatic small parts warehouses (AKL) with storage and retrieval machine (SRM) so called "shuttle systems" are used now. These are storage systems for light cargo such as containers, boxes, or trays that are used also outside the storage area for transport. Depending on the system design, the shuttle systems structured and described in this standard (in the interest of the small container storage) combine the functions "storage" and "conveyance". The performance is compared with other systems, defined and considered with important additional criteria for system selection. The essential feature of the technology is the separation of horizontal transport and vertical transport. Usually, the shuttle vehicles take over the horizontal transport and load absorption and release, while the vertical transport is realised via lifts.