Challenging behaviours in New Zealand classrooms are at critical levels. 

Over the last 20 years student behaviour has been among the worst in the OECD but new research shows it's worsened over the past two. 

Education Review Office research has found a quarter of principals have seen students physically harm others and steal property at least every day. 

Education Hub Founder Nina Hood told Mike Hosking that it's important to draw schools' attention to behaviour. 

She says it's up to individual schools to create clear expectations, consistent rules, put structures in place, and uphold them. 

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