(1) “Generally implied” means that it is custom or common practice for the organization, its customers and other interested parties, that the need or expectation under consideration is implied. (2) A qualifier can be used to denote a specific type of requirement, e.g. product requirement, quality management requirement, customer requirement. (3) A specified requirement is one which is stated, for example, in a document. (4) Requirements can be generated by different interested parties.