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This depends on the organisation's objectives and operating model. As a general rule, but by no means the only approach, is that an organisation should assess its top risks as often as the board/steering committee meets, as well as at the beginning, middle and end of each major project.
It would also be beneficial to assess and revise risks during the business planning and forecasting phase, which for many large companies takes around3 months to complete.
Depending upon the long term and short term inspection intervals, comparative usability and effectiveness of new one and old one techniques, previous inspection result evaluations and change of regulations and safety aspects need the organization to refresh its top risks.