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- Vol 6 RE: Chapter 8, App A, App D, App E
lesson studyfractions knowledgeresearch-based resourcesteacher collaborationprofessional learninginstructional adaptationstudent thinkingrandomized controlled trialJournal article Evidence summaryAt a glance
Lewis and Perry test whether lesson study combined with research-based mathematical resources can scale knowledge about fractions. Thirty-nine educator teams across the United States were randomly assigned to locally managed lesson study using a fractions resource kit or to one of two control conditions.
Key ideas
Most participants were elementary teachers, and teams worked independently over three months. The kit integrated research on student thinking and linear representations with a lesson-study cycle of investigation, planning, a live research lesson, observation, and reflection. Hierarchical analyses found significantly greater improvement in educators’ and students’ fractions knowledge in the resource-supported lesson-study condition. The design sought to avoid a common scale-up trade-off: tightly scripted materials may preserve content but reduce teacher ownership, while locally controlled professional learning may lack access to specialised research. Combining high-quality resources with collaborative inquiry allowed teachers to adapt while studying the underlying ideas.
Why it matters
The trial supports this particular package, not lesson study under all conditions. Results depend on team engagement, resource quality, facilitation, and implementation, and the sample size limits claims about settings unlike those studied.
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Edition abbreviations
- TE
- Teacher Edition
- PE
- Practice Edition
- RE
- Research Edition
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