Harmonised Standard. This is a standard which: is adopted by CEN (development, voting, approval etc.); is developed under a mandate given by the EU; is published (by reference) in the Official Journal 35; supports one or more essential requirements of a 'New Approach' directive and, when published, permits the user to claim presumption of conformity; could be for a material or a piece of equipment (a 'product'), or be procedural; and contains annexes (ZA, ZB etc.) listing the clauses which meet the essential requirements of the directives which it addresses.