Secondary schools are increasingly delivering a range of mental health interventions with varying levels of success. This cluster randomised controlled trial examined the effectiveness of two implementation strategies, allocation of class time and provision of financial incentives, on secondary students’ engagement with Smooth Sailing, a universal web-based mental health service.

Findings from the trial highlight the challenges of optimising student engagement with digital mental health services in school settings and emphasise the importance of considering the broader school context when implementing such interventions.