From the School Handbook:

Working With Children Check (WWCC)

In order for the school to ensure that all staff and volunteers have the necessary WWCC, all parents who wish to volunteer are asked to ensure that they have the appropriate clearance in order to remain as a volunteer within the school. Once the WWCC is completed the school maintains a register of parents who are able to volunteer within the school. This includes classroom assistance, excursions, camps, canteen, library assistance and general helping about the school.

Further information  about the Working With Children Check can be found on the CEDoW website. Follow this link to the website.