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We discuss an original study and two replications conducted over 18 years examining the impact of Teacher Study Group (TSG) in Vocabulary, a professional development (PD) approach for improving pedagogy and student learning. Study 1 focused on the design and development of the PD and included a small-scale randomized controlled trial to assess the efficacy of the TSG model with grade 1 teachers. Study 2 was a scale-up study conducted in grade 1. Study 3 examined the efficacy of the TSG when implemented with grade 8 teachers of American history. We highlight similarities and differences in methodology and results among the studies and conclude with a discussion of the pattern of findings followed by a reflection on issues emanating from this line of research. [ABSTRACT FROM AUTHOR]

This article reports on a project implemented to help middle school teachers provide evidence-based instruction and intervention to students with mathematics learning disabilities (MLD) and mathematics difficulties (MD). Multiple sources—interviews, surveys, and field notes from formal and informal observations—were used to gather data on teacher perceptions and feedback on what worked and what did not in this professional development effort. We also examined the mathematics achievement of students with MLD and MD and compared their growth to that of their typically performing peers at the two participating schools. We highlight and discuss the key issues and concerns that emerged from this implementation study. [ABSTRACT FROM AUTHOR]