RecruitingBehavioural interventionEfficacy of the I-CARE Digital Health InterventionWhen presenting to an ED with suicide, self-harm or other mental health crises, youth may also experience "boarding", which is defined by the Joint Commission as "the practice of holding patients in the ED or another temporary location after the decision to admit or transfer has been made." A recent national survey of 88 US acute care hospitals conducted by our research team found that 98.9% of hospitals were boarding youth awaiting psychiatric hospitalization, for an average of 2-3 days. However, as illustrated in a systemic review, little research has focused on developing interventions to support youth during this highly vulnerable time. 3 I-CARE is a modular, blended digital health intervention facilitated by individuals who are not mental health clinical staff to teach youth evidence-based psychosocial skills during the boarding period. This study will evaluate I-CARE's efficacy using a patient-level randomized clinical trial (RCT), randomizing youth to receive standard safety supervision or I-CARE in addition to standard safety supervision. If found to the efficacious, I-CARE could be scaled-up in new settings with limited resources and has the potential to significantly improve the quality of care received by youth experiencing boarding.