ISO 20332:2008 sets forth general conditions, requirements, methods and parameter values for performing proof-of-competence determinations of the steel structures of cranes based upon the limit state method. It is intended to be used together with the loads and load combinations of the applicable parts of ISO 8686. ISO 20332:2008 is general and covers cranes of all types. Other International Standards may give specific proof-of-competence requirements for particular crane types. It does not cover proof‑of‑competence calculations for components of accessories (e.g. hand rails, stairs, walkways, cabins), whose influence on the main structure nevertheless needs to be considered.