An employer must review the assessment if-
- there is reason to believe that the previous assessment is no longer valid;
- control measures are no longer efficient;
- technological or scientific advances allow for more efficient control methods; or
- there has been a significant change in-
(i) work methods;
(ii) the type of work carried out; or
(iii) the type of equipment used to control exposure, and subregulations (2) and (3) shall apply.