Among the reasons for limited data sharing could be the fact that it is not easy to use the school-wide data to extract data about individual students. Also, the lack of a data sharing tradition may take time to overcome. Schools are required to report annually on their progress to the Ministry of Education. Based on the interviews conducted during the OECD review visit to New Zealand, the OECD review team formed the impression that there was room to further clarify the purpose and use of this type of reporting information at the level of the Ministry. Several stakeholders we interviewed questioned whether the data reported by schools to the Ministry was actually used purposefully for accountability or improvement.