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Schedule and Plans

Each of the international large-scale studies has its own project schedule and cycle, but all have a field test, main data collection, and release of results. This calendar of IAP studies provides an overview of each study’s schedule and plans across the next 4 years.

Season 2021 2022 2023 2024
  • TIMSS Field Test
  • ICILS Field Test
  • TALIS Field Test
  • PIAAC Data Collection (contd.)
  • TIMSS Data Collection
  • ICILS Data Collection
  • TALIS Data Collection
  • PISA Financial Literacy Release of Results
  • PIAAC Field Test
  • PISA Field Test
  • PIRLS Data Collection
  • PIAAC Data Collection
  • PISA Data Collection
  • PIAAC Data Collection (contd.)
  • PIRLS Release of Results
  • PISA Core Release of Results
  • PIAAC Release of Results
  • TIMSS Release of Results
  • ICILS Release of Results
Field Test. As part of the development of each study, a field test is conducted to evaluate the study in two areas: (a) its assessment and background questions; and (b) its data collection operations, procedures, and equipment. Based on the results of the field test, any questions that are found to be problematic are dropped or fixed, and operational challenges that are uncovered are addressed in preparation for the main data collection.
Data Collection. The administration of each international assessment or survey is known as the "main study data collection." Each study has its own required timeframe during which data must be collected to be internationally comparable.
Release of Results. After each international assessment or survey is administered, the data are checked, compiled, and prepared for analyses, which include deriving variables, creating indexes, and calculating weights and plausible values. Once these steps have been completed, the data are analyzed and the results are compiled in a report. It typically takes 18 to 24 months from the data collection to the release of the international results.