They will vote on a proposed industrial agreement covering salaries and conditions with the NSW Department of Education.

As a result of this, there will be minimal supervision at schools until classes commence by 10.30am.

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It is understood schools that have planned an event such as a concert or picnic will be exempt from this arrangement.

A NSW Department of Education spokesman said schools would operate as normal on Thursday.

"All students will be supervised during the NSW Teacher's Federation meeting," the spokesman said.

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