For critically ill patients who are unable to participate in their own care and decision-making, partnering with their family members is particularly important for improving experiences and outcomes of care for both patients and families. The IMPACT trial is a mixed methods clinical trial involving 150 families allocated to 3 groups (2 active interventions and a usual care group). The IMPACT trial aims to demonstrate that the tools and training provided to family members will increase their satisfaction with care, and their ability to act as agents of best practice. This will be translated into better patient and family-centred outcomes over the long-term, compared to usual care.