Supporting Children’s Working Memory Through Instructional Support in Primary School: A Microtrial Study

Working memory (WM) is crucial for learning and academic success, emphasizing the need for effective theory- and practice-informed interventions supporting children with poor WM. Given limited transferable effects, recent research stresses the importance of context, focusing on malleable environmental factors like teacher–student interaction. This study uses a microtrial approach to explore the effects of teacher-provided instructional support on children’s observable WM-related problematic behavior. The experimental group (n = 35, 42.9% girls, Mage = 8.37, SDage = 1.66) received targeted instructional support, while the control group (n = 32, 40.6% girls, Mage = 8.67, SDage = 2.03) received teaching as usual. Pre- and post-intervention comparisons examined changes in students’ WM behavior. The four-week intervention included five strategies derived from a systematic review and a qualitative study, building on teachers’ existing practices. Findings revealed a significant time × condition interaction, with reduced WM-related problematic behavior in the experimental group, showing medium to large effect sizes (ηp2 = 0.08–0.20). Improvements were noted in classroom behavior and the home environment, as reported by parents blinded to the condition. This study contributes to the causal evidence base indicating that targeted instructional support can reduce WM-related challenges and highlights the potential of brief, teacher-provided classroom interventions.