Under Australian WHS legislation it is a requirement for PCBU’s (Person/s Conducting a Business or Undertaking) to ensure the competency of its workers to perform their tasks safely.
Whilst a worker may have a Vocational Education and Training (VET) unit of competency and associated licence, this only proves that at the time of assessment the operator was competent. Unless the operator used their skills and knowledge regularly their competency may be reduced.
The standards recommend that checking competency should be done based on how often the skill is being used or applied. However, in many sites around Australia a worker will not be deemed as current unless they have undertaken a VoC assessment within the past 24 months.