The Government's task force on school discipline risks ignoring the root causes of bad behaviour, the leader of Britain's biggest teachers' union says.
Steve Sinnott, general secretary of the National Union of Teachers, said a "rigid" school curriculum turned children off their lessons and led them to behave badly.
But the new working group, announced by Education Secretary Ruth Kelly last month, is set to focus on the "problems" rather than the causes of the problems, he said.
"The curriculum is too rigid and does not allow teachers to respond to the pupils in the class and develop along the lines that will stimulate the class," he said. "Pupils become disengaged."
Ms Kelly announced the working group amid increasing concern over rising levels of pupil violence and disruption.
Heads have complained that parents are also increasingly likely to lash out at teachers if they feel aggrieved.
Mr Sinnott reiterated his call for a national inquiry into school discipline issues.
The new task force on pupil behaviour will be made up of heads and teachers who are "expert" in tackling poor discipline.
The so-called Leadership Group will report back to the Government with policy proposals in the autumn.
A spokesman for the Department for Education said: " Many schools already have excellent standards of discipline and are well ordered places for children to learn. We want that to be the norm."