each pisa cycle assesses three core domains reading mathematics and science one of which constitutes the major domain in a given cycle reading in and mathematics in and and science in and the major domain receives a larger portion of testing time and questionnaire items tend to focus on students engagement attitudes and dispositions towards the main subject domain since the assessment was delivered by computer testing material in pisa is typically organised around subject specific clusters designed to take around minutes to complete and each booklet contains four clusters of test items