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The review will form part of an investigation which will help the Carisbrook School board of trustees and the Ministry of Education to decide later this year whether the school will remain open.
Carisbrook School was established at the end of 2011, as a result of a merger between Caversham, College Street and Calton Hill schools.
At the time of the merger, Education Minister Hekia Parata decided the new school would operate across two sites, the main site being on the former Caversham site, now known as Carisbrook Main, and a second campus at Calton Hill, now known as Carisbrook Heights.
Ministry of Education enablement and support sector head Katrina Casey said the minister had indicated at the time the operation of the split site should be reviewed at the end of 2014, first by ERO and then by the ministry.
In 2013, the ministry funded an external facilitator to assist the board with community consultation about the future operational structure of Carisbrook School, she said.
No decisions had been made as a result of this.
ERO was in the process of reviewing the school, and its report had not yet been publicly released, she said.
Ms Casey said Carisbrook School was operating as a split site at present.
Any decision about the future of the site would need to be a board of trustees decision, supported by the ministry.
''There is no decision required to close the school, because it no longer operates as a separate school.
''It belongs to a merged school that operates from two sites,'' she said.
Principal Ben Sincock said Carisbrook Heights had 45 pupils at present.
He said he and the board of trustees would like to see a copy of the ERO report on the school before making any comment about the future of the facility.