The HSE Mental Health Engagement and Recovery Office and Genio Trust collaborated to fund a research study to examine service involvement for some of the populations supported by these Offices who can encounter barriers to social inclusion. These populations include: (1) those who use drugs and alcohol; (2) those who experience homelessness; (3) those who experience mental health challenges; (4) those from migrant, minority ethnic and Roma backgrounds; and (5) members of the Traveller community. The purpose of this work was to inform the strategies of the two HSE Offices in relation to these groups, to support Genio Trust’s service reform programmes in this area, and more broadly to inform any future HSE agendas with respect to public and patient engagement.