The Working with Children Check - WWCC - is a screening mechanism to prevent certain persons from engaging in child-related work.
Declaration for child-related workers (nsw.gov.au)
This declaration is to be completed by current and prospective employees, contractors, volunteers, and other persons seeking to be engaged in child-related work.
WWCC Fact Sheet (pdf 23 KB)
Guide to Identity Documents (nsw.gov.au)