Background: Person-centred care (PCC) is gaining momentum in many health systems as a shift from provider-centric to patient-centric services, emphasizing meaningful lives over purely functional outcomes. In Sweden, PCC is a key priority in national healthcare policy and law and is being explored as a response to demographic and financial challenges. However, most research on PCC focuses on hospital settings and chronic illness, while knowledge about its implementation in municipal care remains limited. Study Context: In 2024, the city of Helsingborg launched a municipality-wide training initiative in PCC, targeting all staff across elder care and disability support services. The initiative includes a web-based course, followed by individual and group reflections aimed at fostering shared understanding and practical transformation. The training was developed in collaboration with patient representatives, grounded in the European standard for patient involvement in healthcare. Study Aim: This research aims to explore how PCC is implemented through this initiative. The study will examine changes in care practices, staff perspectives, and experiences of patients and service users. Methods: Using a mixed-methods design, the study includes surveys (mP-CAT and PERCCI-S), focus groups, and administrative data. Data will be collected before and after the intervention from staff, patients, and service users across a range of municipal care contexts. The study employs a participatory follow-up research approach, observing changes without influencing the intervention process. Expected Contribution: This study will generate critical knowledge about the implementation of PCC outside hospital settings, including the feasibility of adapted measurement tools, perceived changes in care quality, and organizational impact. Results will be able to be presented at the time of the conference.