need or expectation that is stated, generally implied or obligatory
“Generally implied” means that it is custom or common practice for the organization (3.2.1) and interested parties (3.2.3) that the need or expectation under consideration is implied.
A specified requirement is one that is stated, for example in documented information (3.8.6).
A qualifier can be used to denote a specific type of requirement, e.g. product (3.7.6) requirement, quality management (3.3.4) requirement, customer (3.2.4) requirement, quality requirement (3.6.5).
Requirements can be generated by different interested parties or by the organization itself.
It can be necessary for achieving high customer satisfaction (3.9.2) to fulfil an expectation of a customer even if it is neither stated nor generally implied or obligatory.
This constitutes one of the common terms and core definitions for ISO management system standards given in Annex SL of the Consolidated ISO Supplement to the ISO/IEC Directives, Part 1. The original definition has been modified by adding Notes 3 to 5 to entry.