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We determined the extent to which these interventions are effective for children who struggle with early writing skills, by calculating effect sizes for group and single-subject designs, and we examined the overall quality of the research. Twenty-five studies met inclusion criteria. Among group design studies, mean effects (Hedge\u2019s g) ranged from 0.19 to 1.17 for measures of writing quantity and from 0.17 to 0.85 for measures of writing quality. Percentage of all nonoverlapping data for single-subject designs ranged from 83% to 100% for measures of writing quantity. Interventions with the strongest evidence of effects and highest methodological quality are described in detail. 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