The Occupational Health and Safety Act (OHSA) states that employers must assess and control risks of workplace violence. This needs to be done as often as necessary to ensure that organizational policies and programs continue to protect workers.
For these reasons, a Workplace Violence Risk Assessment (WVRA) should be completed at least annually, though each organization should have its own processes for determining how often to complete an assessment, and when to evaluate the effectiveness of the process. Generally speaking, revisions are needed when there is a change in the nature of the workplace, type of work, or conditions of work.