In addition to the following questions about TIMSS, more FAQs about international assessments are available at: http://nces.ed.gov/surveys/international/faqs.asp.
The National Center for Education Statistics (NCES), part of the U.S. Department of Education, is responsible for administering TIMSS in the United States and for representing the United States in international collaboration on TIMSS.
The International Association for the Evaluation of Educational Achievement (IEA) coordinates TIMSS internationally. The IEA is an independent international cooperative of national research institutions and government agencies with nearly 70 member countries worldwide. The IEA has a permanent secretariat based in Amsterdam, and a data processing and research center in Hamburg, known as the IEA Data Processing Center (DPC).
The IEA contracts with the TIMSS & PIRLS International Study Center at Boston College to lead the design and implementation of TIMSS. The TIMSS & PIRLS International Study Center works with country representatives, called National Research Coordinators, to design and implement TIMSS, assure quality control and international comparability, and report results. The U.S. National Research Coordinator is Stephen Provasnik of NCES. Data collection for TIMSS 2015 within the United States is done under contract with WESTAT, Inc.