ISO 22915 deals with the safety of industrial trucks, as defined in ISO 5053, relative to their stability and the verification of that stability. For the purposes of ISO 22915, industrial trucks are wheeled, self-propelled or pedestrian-propelled vehicles, excepting those running on rails. They are either operator-controlled or driverless and designed to carry, tow, push, lift, stack or tier in racks. This part of ISO 22915 specifies basic test criteria and requirements to verify stability for industrial trucks, hereafter referred to as trucks. It applies to the following truck types and special conditions: a) counterbalanced trucks with mast, as specified in ISO 22915-2; b) reach and straddle trucks, as specified in ISO 22915-3; c) pallet stackers, double stackers and order-picking trucks up to and including 1 200 mm lift height, as specified in ISO 22915-4; d) single side loading trucks1); e) bidirectional and multidirectional trucks, as specified in ISO 22915-7; f) additional stability test for trucks operating in special conditions of stacking with the mast tilted forward, as specified in ISO 22915-8; g) counterbalanced trucks with mast handling freight containers of 6 m (20 ft) length and longer1); h) additional stability test for trucks operating in special conditions with the load substantially laterally displaced by powered devices, as specified in ISO 22915-10; i) industrial variable reach trucks1); j) industrial variable reach trucks handling freight containers of 6 m (20 ft) length and longer1); k) rough-terrain variable reach trucks1); l) counterbalanced trucks with articulated steering1); m) pedestrian-propelled trucks1); n) burden and personnel carriers1); o) additional stability test for trucks operating in the special condition of offset load, offset determined by utilization, as specified in ISO 22915-20; p) order-picking trucks with operator position elevating above 1 200 mm, as specified in ISO 22915-21. It also applies to trucks operating under the same conditions when equipped with load-handling attachments. This part of ISO 22915 does not apply to: — trucks handling suspended loads which may swing freely; — low-lift trucks with lift height up to and including 500 mm.