Section 21(2): amended, on 19 December 1998, by section 10(1) of the Education Amendment Act (No 2) 1998 (1998 No 118).
Section 21(6): amended, on 23 July 1990, by section 10 of the Education Amendment Act 1990 (1990 No 60).
Section 21(8A): inserted, on 19 December 1998, by section 10(2) of the Education Amendment Act (No 2) 1998 (1998 No 118).
Section 21(9): inserted, on 1 January 1990, by section 8 of the Education Amendment Act 1989 (1989 No 156).
Section 21 compare note: repealed, on 20 May 2010, by section 11 of the Education Amendment Act 2010 (2010 No 25).