It is important to know if your risk assessment was complete and accurate. It is also essential to be sure that changes in the workplace have not introduced new hazards or changed hazards that were once ranked as lower priority to a higher priority.
It is good practice to review your assessment on a regular basis to be sure that nothing has changed and that your control methods are effective. Triggers for a review can also include:
the start of a new project,
a change in the work process or flow,
a change or addition to tools, equipment, machinery (including locations or the way they are used),
new employees,
moving to a new building or work area,
introduction of new chemicals or substances,
when new information becomes available about a current product.