The International Association for the Evaluation of Educational Achievement (IEA) serves as the international coordinating body for PIRLS.
The TIMSS and PIRLS International Study Center at Boston College directs the study at the international level, including the design, operations, analysis, and reporting.
Westat is the data collection and analysis contractor in the United States for PIRLS 2021.
Pearson Educational Measurement is the contractor in the United States tasked with data scoring and coding for PIRLS 2021.
The American Institutes for Research is the contractor in the United States tasked with management, technical, analytical, reporting, and dissemination support for PIRLS 2021.