The programme for international student assessment is a cyclical operation. The first assessment was in 2000, a second one has just been completed in 2003 and there will be a third in 2006. In 2000, reading literacy was the major domain while mathematics and science were minor domains. The assessment did not fully sample the minor areas and used shorter tests. In the 2003 assessment just completed, the major domain is mathematics with minor domains in science and reading. In 2006 science will be the major domain with the other two as minor domains.