IEC 60300-3-14:2004

Describes a framework for maintenance and maintenance support and  
the various minimal common practices that should be                
undertaken.Outlines in a generic manner, management, processes and
techniques related to maintenance and maintenance support that are
necessary to achieve adequate dependability to meet the operational
needs of the customer.                                              
Applicable to items, which include all types of products, equipment
and systems (hardware and associated software). Most of these      
require a certain level of maintenance to ensure that their required
functionality, dependability, capability, economic, safety and      
regulatory requirements are achieved.