Students with emotional and behavioral disorders (E/BD) have academic deficits that affect their success in school; however, few researchers have investigated what strategies work best for this population, especially in the area of writing. One promising intervention to support the writing skills of students with and at-risk for E/BD is self-regulated strategy development (SRSD). SRSD is a six-stage, explicit strategy instruction model that includes procedures for goal setting, self-monitoring, self-instruction, and self-reinforcement and can be generalized to a variety of writing tasks. The purpose of this study was to determine the effects of an SRSD persuasive writing intervention on the writing achievement of 44 students in a residential school. Results of a piecewise hierarchical linear modeling growth curve analysis suggest statistically significant gains were made over the course of the intervention in writing (quality, correct word sequences, and essay elements) and academic engagement. Effects also generalized to writing achievement measures. In addition, teachers implemented the intervention with high fidelity, and both students and teachers rated the intervention as socially acceptable, with higher ratings postintervention.