Three thousand high school teachers in York Region are set to start their planned job action on Friday.

Teachers may opt not to attend meetings, supervise students outside class or communicate with parents outside school hours.

The group rejected a tentative deal with the province earlier this week.

The union representing Ontario’s elementary school teachers has said next month all public schools will join the five school boards already in a legal strike position.

Sam Hammond, president of the Elementary Teachers’ Federation of Ontario, said strikes are a last resort and, if they happen, parents will get 72 hours’ notice to make arrangements for child care.

He hasn’t decided whether they would be full strikes, rotating strikes or one-day walkouts.

Education Minister Laurel Broten said on Thursday, she could use Bill 115, the Putting Students First Act, to force teachers back to work.