Requirement

Requirements come from standards, regulations, customers and the company’s own documents. A specified requirement is one that is written down.

need or expectation that is stated, generally implied or obligatory Note 1 to entry: “Generally implied” means that it is custom or common practice for the organization and interested parties that the need or expectation under consideration is implied. Note 2 to entry: A specified requirement is one that is stated, for example in documented information. [SOURCE: ISO 9000:2015, 3.6.4, modified — Notes to entry 3, 4, 5 and 6 have been deleted]

ISO 19011:2018, clause 3.23