Introduction: To advance person- and family-centred healthcare, government initiatives have supported the engagement of patients and family caregivers in decision-making in healthcare systems. There is, however, no consensus on how to define success for such initiatives. This scoping review aims to identify the key elements for defining the quality of patient and family caregiver engagement in decision-making across the engagement domains (individual, community/organisation, system) of British Columbia's healthcare system. We will use those elements to develop a conceptual evaluation framework.; Methods and Analysis: This scoping review follows Arskey and O'Malley's methodology. (1) The research question was identified through team discussions. (2) Articles for data source will be identified using a librarian-informed search strategy for seven bibliographic databases as well as grey literature sources. (3) Selected articles will be relevant to the evaluation of patient and family caregiver engagement in healthcare systems. (4) Two researchers will independently extract data into predefined and emerging categories. (5) The researchers will reconcile and organise the identified elements. The research team's collective perspective will then refine the elements, and select, interpret and summarise the results. (6) Persons from key stakeholder groups will be consulted to refine the emergent conceptual framework.; Ethics and Dissemination: We will seek ethics approval for the stakeholder consultation. This study follows an integrated knowledge translation approach. The results will inform evaluation of the Patients as Partners Initiative of the British Columbia Ministry of Health, and will be disseminated as a scientific article, a research brief, and presentations at conferences and stakeholder meetings.;