Abstract
PISA and the assessment triangle. PISA is a well-known and high profile Program for International Student Assessment with 4 editions since 2000. This study aims to examine the validity of PISA proficiency estimates, working with the framework provided by the assessment triangle. We pay explicit attention to how PISA proceeds as far as the three elements of the assessment triangle are concerned: cognition, observation, and interpretation. Results reveal not only the psychometrically sound proficiency estimates of PISA and the high standards reached, but also that there is room for improvement; for instance, cognitive diagnostic models could contribute both to test design and data analysis.
