The NASUWT President, Paula Roe, tells itv News that delegates are angry and will consider strike action unless the Government listens to their demands.
Ms. Roe, who works at Redhill School in Stourbridge, says members do not want to jeopardise exams, but their workload is too much with excessive monitoring and administration work. She says they want more time actually to teach.
She says: "We believe very strongly, as we've heard with passion this morning, that it's the future of young people we're really concerned about and so any action we take is not to impact upon them but to get a Government who's not listening to listen to us."
Their annual conference is being held across the Easter weekend at the International Convention Centre in Birmingham. They were addressed this afternoon by the Shadow Education Secretary, Stephen Twigg MP who accused the Government of undermining teachers.