"Excellence gaps" are the disparities in advanced academic performance that exist between student groups. These gaps have important implications for both academic equity and American economic competitiveness, as the most lucrative jobs often go to those who perform at the highest levels. Although considerable work has evaluated how and…

Although Montessori is the most common unconventional education model, no multi-state study has compared standardized test proficiency of Montessori schools with districts. Here we report on this for the 10 states/regions with the most public Montessori schools (n = 195). In 3rd grade, Montessori schools were less proficient in math but more…

The purpose of this technical appendix is to share detailed results and more fully describe the sample and methods used to produce the research brief, "COVID's Impact on Science Achievement: Trends from 2019 through 2024. We investigated three main research questions in this brief: 1) How did science achievement in 2021 and 2024 compare to…

Although Montessori is the most common unconventional education model, no multi-state study has compared standardized test proficiency of Montessori schools with districts. Here we report on this for the 10 states/regions with the most public Montessori schools (n = 195). In 3rd grade, Montessori schools were less proficient in math but more…

The number of charter schools grew rapidly for a quarter-century after the first charter opened its doors in 1992. But since 2016, the rate of increase has slowed. Is the pause related to a decline in charter effectiveness? To find out, the authors tracked changes in student performance at charter and district schools on the National Assessment of…

This article reports on two professional development programs for mathematics teachers and their effects on student achievement. The projects' design and their implementation within a larger municipality in Sweden, working together with over 90 teachers and 5000 students in elementary school, are described by using a set of core critical features…

We use a quadratic equation to estimate trends in cohort performances in the charter and district sectors on the National Assessment of Educational Progress in 4th and 8th grade between 2005 and 2017. Data consist of over four million test observations of nationally representative samples of students on seven separate math and reading tests. We…

Austin ISD is one of 21 US urban school districts participating in the National Assessment of Education Progress (NAEP) Trial Urban District Assessment (TUDA). AISD students consistently perform well on the 4th and 8th grade reading and math assessments. This supplemental report summarizes 2015 results. A separate research brief also was…

Austin ISD is one of 21 US urban school districts participating in the National Assessment of Education Progress (NAEP) Trial Urban District Assessment (TUDA). AISD students consistently perform well on the 4th and 8th grade reading and math assessments. This research brief summarizes 2015 results. A separate supplemental report also was…

South Africa participated in TIMSS from 1995 to 2015. Over these two decades, some positive changes have been reported on the aggregated mathematics performance patterns of South African learners. This paper focuses on the achievement patterns of South Africa's high-performing Grade 9 learners (n = 3378) in comparison with similar subsamples of…

Since 1973, the National Assessment of Educational Progress (NAEP) has gathered information about student achievement in mathematics. Results of these periodic assessments, produced in print and web-based formats, provide valuable information to a wide variety of audiences. They inform citizens about the nature of students' comprehension of the…

Are U.S. and, in particular, Hoosier students competitive and ready to succeed in an ever-changing and increasingly global economic landscape? This question is frequently considered by K-12 education stakeholders at all levels, including national, state, and local officials. One of the central ways in which education systems can compare themselves…

As the U.S. population has become increasingly diverse--a continuing trend led by children--there has been an accompanying rise in the number of children who grow up hearing and learning more than one language. Dual language learners represent an important asset for our nation's future, since those who have fluency in more than one language have…

Only 35 percent of U.S. 8th graders were identified as proficient in math by the 2011 National Assessment of Educational Progress (NAEP). According to the most recent calculations available, the United States stands at the 32nd rank in math among nations in the industrialized world. In reading, the U.S. ranks 17th in the world (see "Are U.S.…

Every country strives for its students to have advanced achievement in some way, shape, or form. But too often, competence is a higher policy priority than excellence, and shrinking minimum competency gaps is a higher priority than closing excellence gaps. In this brief, educational excellence is defined as the percent of students who meet or…