Continuous improvement is one of the main principles and guidelines of ISO Standards. The ISO organization constantly evaluates and updates the standards to reflect the most recent best practices, notwithstanding the claims of some critics that the standards are static. The ISO 9001 quality management standard, for instance, has undergone multiple revisions that have addressed new trends and technology and taken into account input from industry experts. Although the rate of periodic updates may not always keep up with the quick changes in some industries, this procedure guarantees that the standards will always be appropriate and relevant.