TY - JOUR AU - J. Elston AU - F. Gradinger AU - T. Bockarie AU - K. Tomblin AU - G. Snaith AU - R. Byng AU - S. Asthana A1 - AB - INTRODUCTION: Population Health Management (PHM) is a UK priority for Integrated Care Systems (ICSs), aiming to deliver proactive, preventative, person-centred care using integrated health and care datasets. However, evidence on implementation in primary care remains limited. METHODS: This comparative case study used embedded researchers, ethnography, interviews, and observations to formatively evaluate a 24-month PHM programme across 31 Primary Care Networks in one ICS. Data were thematically analysed using Excel and NVivo, with findings fed back to participants to guide programme delivery. RESULTS: Around 200 stakeholders participated in Action Learning Sets, fostering cross-sector collaboration within four localities. Few innovations, developed using integrated datasets, progressed to delivery, limiting their impact on patient health. While PHM infrastructure was established, delivery was constrained by operational pressures, data governance challenges, limited resources, lack of strategic integration and the nature of local relationships. DISCUSSION: Effective PHM implementation requires more than infrastructure and governance. It depends on developing system-wide soft skills (facilitation, co-production), motivating stakeholders, and investing in processes that support insight generation, innovation piloting, and evidencing of impact. CONCLUSION: The study highlights the need for stronger strategic integration, sustained resourcing, coordination, and co-production to realise PHM's potential at system, place and neighbourhood levels in addressing health inequalities and improving population outcomes. AD - Community and Primary Care Research Centre, University of Plymouth, United Kingdom.; Plymouth Health Determinants Research Collaboration, United Kingdom.; Honorary Global Health Researcher, King's College London, United Kingdom.; Devon County Council, United Kingdom.; NHS Devon Integrated Care Board, United Kingdom.; Centre for Health Technology, University of Plymouth, United Kingdom.; Centre for Coastal Communities, University of Plymouth, United Kingdom. AN - 42040046 BT - Int J Integr Care C5 - Education & Workforce CP - 2 DA - 12/1969 DO - 10.5334/ijic.10027 DP - NLM ET - 20260424 IS - 2 JF - Int J Integr Care LA - eng N2 - INTRODUCTION: Population Health Management (PHM) is a UK priority for Integrated Care Systems (ICSs), aiming to deliver proactive, preventative, person-centred care using integrated health and care datasets. However, evidence on implementation in primary care remains limited. METHODS: This comparative case study used embedded researchers, ethnography, interviews, and observations to formatively evaluate a 24-month PHM programme across 31 Primary Care Networks in one ICS. Data were thematically analysed using Excel and NVivo, with findings fed back to participants to guide programme delivery. RESULTS: Around 200 stakeholders participated in Action Learning Sets, fostering cross-sector collaboration within four localities. Few innovations, developed using integrated datasets, progressed to delivery, limiting their impact on patient health. While PHM infrastructure was established, delivery was constrained by operational pressures, data governance challenges, limited resources, lack of strategic integration and the nature of local relationships. DISCUSSION: Effective PHM implementation requires more than infrastructure and governance. It depends on developing system-wide soft skills (facilitation, co-production), motivating stakeholders, and investing in processes that support insight generation, innovation piloting, and evidencing of impact. CONCLUSION: The study highlights the need for stronger strategic integration, sustained resourcing, coordination, and co-production to realise PHM's potential at system, place and neighbourhood levels in addressing health inequalities and improving population outcomes. PY - 2026 SN - 1568-4156 (Print) SP - 5 ST - Implementing Population Health Management (PHM) Across an Integrated Care System in England, Using Action Learning Sets and an Embedded, Formative Process Evaluation T1 - Implementing Population Health Management (PHM) Across an Integrated Care System in England, Using Action Learning Sets and an Embedded, Formative Process Evaluation T2 - Int J Integr Care TI - Implementing Population Health Management (PHM) Across an Integrated Care System in England, Using Action Learning Sets and an Embedded, Formative Process Evaluation U1 - Education & Workforce U3 - 10.5334/ijic.10027 VL - 26 VO - 1568-4156 (Print) Y1 - 2026 ER -