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Complex projects such as PIRLS cannot be accomplished by only one agency or organization. Throughout the course of PIRLS, the National Center for Education Statistics works with multiple partners.
 | The International Association for the Evaluation of Educational Achievement (IEA) serves as the international coordinating body for the PIRLS studies. |
 | The PIRLS International Study Center at Boston College directs the studies at the international level including the design, operations, analysis, and reporting. |
 | RTI International managed the United States implementation of PIRLS 2006. |
 | Westat managed the United States implementation of PIRLS 2001. |
