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PDSA may refer to: PDSA (plan–do–study–act), a quality improvement process; People's Dispensary for Sick Animals, a UK veterinary charity;
The Programme for International Student Assessment (PISA) is a worldwide study by the Organisation for Economic Co-operation and Development (OECD) in member and non-member nations intended to evaluate educational systems by measuring 15-year-old school pupils' scholastic performance on mathematics, science, and reading. [1]