All vessels have to be registered with a Classification Society in order to trade. The records held there show how a vessel is being maintained according to the required survey cycles and any recurring problems will be evident. Also, if a vessel has a record of changing from one Classification Society to another quite frequently during its life, this could indicate that the maintenance may be poor. The inspection of the Class (classification) records gives the inspector of the actual vessel some guidelines for any areas that may need to be especially considered when the physical inspection of the vessel takes place. The inspection of the vessel’s Class records and a physical inspection of the vessel would normally be carried out by the buyers’ own technical staff but sometimes independent surveyors are used.