ERO is unable to tell RNZ if it's making more recommendations for support or intervention in schools than in the past. Photo: Getty ImagesOne in five schools recently scrutinised by the Education Review Office needs external support or intervention. ERO was unable to tell RNZ if it was making more recommendations for support or intervention than in the past. However, it said it was "building a tracker" to indicate what types of support or intervention it recommended most. Among the 21 review reports recommending support or intervention, 17 called for new action and five recommended continuing existing measures.