Scotland's last all-girls state school will admit boys for the first time.
Pupils from Notre Dame High School in Glasgow had campaigned to keep the school all-girls, but this was overruled by Glasgow City Council.
From August 2021, boys will be admitted to the Catholic school - but only in S1 that year.
A public consultation had been carried out, to assess whether there was a demand for the school to become co-educational.
A report by education officers recommended entry criteria to the secondary school to become co-educational.
Maureen McKenna, Executive Director of Education, Glasgow City Council said today: "There has been much debate on the changes to the entry criteria for Notre Dame High School with strong arguments being put forward - both during the pre-engagement and the consultation process.
"Now that the decision has been made by elected members, education officers will start to develop transition plans and will engage with school and parent representatives from all the associated primary schools and secondary schools affected by changes.
"There's not only the physical aspects that need to be considered but we also need to be sensitive and recognise that this represents a significant change for the school and local community.
"I am confident that Notre Dame High School will continue to provide an excellent education to the young people of Glasgow and their families."
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