In educational effectiveness research, it frequently has proven difficult to make credible inferences about cause and effect relations. The article first identifies the main categories of threats to valid causal inference from observational data, and discusses designs and analytic approaches which protect against them. With the use of data from 22…

Ensuring a safe learning environment for students is a major responsibility of educators and policymakers around the world. Based on the secondary analyses of the Trends in International Mathematics and Science Study (TIMSS) data collected from 33 countries in 1999, the study found that 8th graders who witnessed their friends' violence…

In the scientific literature, the debate around the school and class effect is polarized, because the variance between schools and classes is explained either by school and class process or by group composition. The first aim of this article is to shed light on this debate and move beyond it by reviewing qualitative and quantitative studies…

The study investigated the relation between district culture, student achievement, and student attitudes about their schools. Perceptions of students as expressed in more than 2,000 essays written about their schools were explored. Seven cultural categories were examined for differences across grade levels and districts. Statistical differences…