Competency assessment tools are well-recognised as a method to achieve a standardised level of practice for a group of healthcare professionals with similar characteristics. The aim of this study is to develop and pilot a new competency assessment tool to support therapists caring for patients with blunt chest trauma from prehospital care through to long-term follow-up following hospital discharge.

A mixed-methods study will be undertaken, with three distinct phases: (1) an integrative narrative review to examine the literature regarding therapist competencies; (2) focus groups with patients, therapists and key stakeholders to explore opinions regarding important aspects of care (phases I and II will inform the content of the tool), followed by final tool development by an international expert panel; and (3) a multicentre pilot study using questionnaires and elicitation interviews, in which final tool acceptability to therapists will be tested. The total sample size will be between 40 and 50 participants for the focus groups. For the final tool development work, a panel of 10 international experts will be identified, with a subgroup of 3–5 experts who will be recruited to confirm content validity. We will pilot the tool at five health boards in Wales, aiming for 10 therapists from each. Elicitation interviews will be undertaken with a smaller sample size of between 15 and 20 therapists. A mixed qualitative and quantitative data analysis approach will be used.

Proportionate ethics approval has been granted (South Yorkshire Research Ethics Committee, reference number: 24/YH/0231). We will publish the work in an open-access peer-reviewed journal to ensure equitable access and present at relevant conferences. Webinars will be used to achieve a wide audience. The results will be shared with the research participants via an infographic which will be designed and developed with the public research partners.

Integrative review is registered at the Open Science Framework: https://doi.org/10.17605/OSF.IO/CEXNR