Teachers in Ontario's public elementary and high schools won't be performing some administrative work starting today as part of work-to-rule campaigns.
They say months of contract talks with the government have produced little progress.
The tasks the teachers will stop performing include putting comments on report cards, attending certain meetings and participating in standardized testing.
President of the Niagara local, Elementary Teachers' Federation of Ontario Jada Nickelfork says Niagara teachers waited outside schools until 15 minutes before the bell ringing, and they all walked in together.
St.Catharines MPP Jennie Stevens' office supported Harriett Tubman Elementary School this morning.
Stevens sent out a tweet with pictures and thanked teachers for standing up against 'Ford cuts to classrooms.'
The union has talks scheduled with the province on Wednesday and Thursday, and union officials says escalating the strike after that point is possible.
Education Minister Stephen Lecce said the government has been reasonable in contract talks, scaling back increases to class sizes and mandatory e-learning requirements.