International large-scale assessments of student achievement such as International Association for the Evaluation of Educational Achievement’s Trends in International Mathematics and Science Study (TIMSS) and Progress in International Reading Literacy Study and Organization for Economic Cooperation and Development’s Program for International Student Assessment that have come to prominence over the past 25 years owe a great deal in methodological terms to pioneering work by National Assessment of Educational Progress (NAEP). Using TIMSS as an example, this article describes how a number of core techniques, such as matrix sampling, student population sampling, item response theory scaling with population modeling, and resampling methods for variance estimation, have been adapted and implemented in an international context and are fundamental to the international assessment effort. In addition to the methodological contributions of NAEP, this article illustrates how the large-scale international assessments go beyond measuring student achievement by representing important aspects of community, home, school, and classroom contexts in ways that can be used to address issues of importance to researchers and policymakers.