Antisocial peer behavior and low parental knowledge of adolescents' activities are key interpersonal risk factors for adolescent substance use. However, how the magnitude of associations between these risk factors and substance use may vary across adolescence remains less well understood. The present study examined the age-varying associations of…

In this quasi-experimental study, 608 fourth-, fifth-, and sixth-grade students explored 5 historical investigations. In the experimental condition, teachers used a cognitive apprenticeship model to teach students historical reading and writing strategies. Comparison teachers used the same materials to deliver a business-as-usual form of…

The purpose of this study was to determine whether restrictions put in place during the COVID-19 pandemic affected the social and psychological well-being of early adolescent schoolchildren. Participants were 309 youth (51% female, average age = 12.38 years) enrolled in the sixth, seventh, or eighth grades of a single middle school located in…

Numerical understanding and arithmetic skills are easier to acquire for whole numbers than fractions. The "integrated theory of numerical development" posits that, in addition to these differences, whole numbers and fractions also have important commonalities. In both, students need to learn how to interpret number symbols in terms of…

This study describes the process of defining a hypothetical learning progression (LP) for astronomy around the big idea of "Solar System formation." At the most sophisticated level, students can explain how the formation process led to the current Solar System by considering how the planets formed from the collapse of a rotating cloud of…

We examined developmental and individual differences in 6th and 8th graders' fraction arithmetic and overall mathematics achievement and related them to differences in understanding of fraction magnitudes, whole number division, executive functioning, and metacognitive judgments within a crosssectional design. Results indicated that the difference…

Cyberbullying is a problem among today's adolescents, specifically within the middle school environment. The use of technology to harass and intimidate others could cause adverse psychological, emotional, and social effects, which left school administrators unsure of the proper response to handling student needs as well as left many adults…

We examined developmental and individual differences in 6th and 8th graders' fraction arithmetic and overall mathematics achievement and related them to differences in understanding of fraction magnitudes, whole number division, executive functioning, and metacognitive judgments within a cross-sectional design. Results indicated that the…

Grades four to six in three school districts representing rural, suburban, and urban school settings were exposed to a nutrition program. Results disclosed that students having access to the nutrition unit significantly out-performed students lacking access and that teachers needed to receive pre-implementation inservice education regarding the…