This project developed a clinical tool to address problems associated with hearing aid use. Participatory methods were used, involving both hearing aid owners and clinicians. The survey developed evaluates the skills and knowledge required for hearing aid management: the Hearing Aid Skills and Knowledge Inventory (HASKI). Psychometric evaluation demonstrated that the survey is valid, reliable and clinically feasible. The translational phase of the projects identified the high prevalence of deficiency in hearing aid management skills and knowledge among hearing aid owners, the magnitude of the deficiency, and the impact of poor management on audiological outcomes.