Cardiff County Council's executive has unanimously decided to press ahead with consultation on proposals to reorganise the city's secondary schools.
The plans include shutting three English-medium schools in the east of the city and opening a new one.
The city's third Welsh-medium comprehensive would also be established in the area.
There are currently 20 secondary schools in Cardiff but there are 4,500 surplus places.
The plans, originally outlined in July, propose closing Llanedeyrn, Llanrumney and Rumney high schools.
A new school would be created on the site of the Eastern Leisure Centre and a third Welsh-medium high school would also be established in the area.
The consultation process runs from 5 November 5 to 21 December.
The proposals were put forward by the council's schools sub-committee, which includes members from all political parties.
On Monday councillors voted to:
The county council has proposed a staged school reorganisation after closures discussed two years ago were dropped following fierce opposition.
The council has said it is taking action in response to demands from the Welsh Assembly Government and the education inspection body Estyn for progress in removing surplus places.
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