Aboriginal and Torres Strait Islander (A&TSI) people presenting emergency departments are more likely to experience difficulty in communicating with healthcare providers, feel isolated, and experience shame and distress. These feelings lead to them leaving before they have been seen, or leaving before their treatment is completed, and they experience poorer health outcomes. Cultural safety is the ability of an organisation to meet the cultural needs of a group of people, and improved emergency department cultural safety has been shown to reduce rate of Aboriginal and Torres Strait Islander people leaving without being treated or before their treatment is completed. The 15 Steps Challenge Toolkit was developed in the NHS and is effective in assisting healthcare providers to see a clinical space “through the eyes of consumers”. This project aims to adapt the NHS 15 Steps Challenge toolkit to make it relevant to the experience of Aboriginal and Torres Strait Islander peoples using co-design methodology based on the “Yerin Dilly” model, which outlines values and processes to make research culturally safe. The project will be conducted in three phases to develop, trial and evaluate the Deadly Steps process. It will use both qualitative and quantitative methodologies to evaluate the process. The impacts of this project will be an improved process for evaluating and identifying opportunities to improve cultural safety, new cultural safety educational materials for healthcare providers, and improved experiences for Aboriginal and Torres Strait Islander people attending emergency departments in the Redcliffe, Caboolture, Sunshine Coast University, and Nambour hospitals.