A scoping review of school-based expressive writing implementation reporting practices: missed opportunities and new research directions.

Background: Expressive writing (EW) interventions are an effective, flexible, and cost-efficient option for mental health promotion, making them ideally suited for resource-limited school settings. However, the effectiveness of EW interventions varies greatly across studies, which may be partly explained by how EW interventions are implemented. As school-based EW interventions become increasingly popular and more widely used, rigorous reporting of implementation can help advance this emerging field by informing how variation in implementation across studies influences intervention outcomes.