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Richard Buddin

David Grissmer, Thomas White, Richard Buddin, Mark Berends, Daniel Willingham, Jamie DeCoster, Chelsea Duran, Chris Hulleman, William Murrah, Tanya Evans.

The Core Knowledge curriculum is a K-8 curriculum focused on building students General Knowledge about the world they live in that is hypothesized to increase reading comprehension and Reading/English-LA achievement. This study utilizes an experimental design to evaluate the long term effects of attending Charter schools teaching the Core Knowledge curriculum. Fourteen oversubscribed kindergarten lotteries for enrollment in nine Core Knowledge Charter schools using the curriculum had 2310 students applying from parents in predominately middle/high income school districts. State achievement data was collected at 3rd- 6th grade in Reading/English-LA and Mathematics and at 5th Grade in Science. A new methodology addresses two previously undiscovered sources of bias inherent in kindergarten lotteries that include middle/high income families. The unbiased confirmatory Reading-English-LA results show statistically significant ITT (0.241***) and TOT (0.473***) effects for 3rd-6th grade achievement with statistically significant ITT and TOT effects at each grade. Exploratory analyses also showed significant ITT (0.15*) and TOT (0.300*) unbiased effects at 5th grade in Science. A CK-Charter school in a low income school district also had statistically significant, moderate to large unbiased ITT and TOT effects in English Language Arts (ITT= 0.944**; TOT = 1.299**), Mathematics (ITT= 0.735*; TOT = 0.997*) and positive, but insignificant Science effects (ITT= 0.468; TOT = 0.622) that eliminated achievement gaps in all subjects.

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Ron Zimmer, Richard Buddin, Sarah Ausmus Smith, Danielle Duffy.

When charter schools first entered the landscape, the debate was contentious, with both advocates and critics using strong rhetoric. Advocates often sold charter schools as a silver bullet solution for not only the students who attend these schools, but the broader traditional public school system as well. Similarly, critics painted charter schools as an apocalyptic threat to public schools. To inform this debate, research has evolved over time, with much of the first generation (through about 2005) of research studies focusing on the effect charter schools have on test scores almost exclusively using non-experimental designs. The second generation of studies more frequently used experimental designs and broadened the scope of outcomes beyond test scores. Furthermore, the second generation of studies has also included studies seeking to explain the variance in performance. In this survey of the research, we summarize the findings across both generations of studies, but we put a greater emphasis on the second generation than prior literature reviews. This includes an examination of indirect effects, examination of explanation of charter effectiveness, and the recent use of charter schools as a mechanism of turning around low-performing schools.

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