When one of the oldest all boys schools in the country declared it would be enrolling girls, it irked some old boys and parents so much that legal action has been threatened to try and stop the move. 

So, why is there so much controversy when single sex schools decide to go co-ed? 

Today, an expert in girls' and boys' schooling, Judith Gill, on the widely held misconceptions in the debate and what the research shows about which system works best. 

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Dr Judith Gill, adjunct associate professor of education at the University of South Australia