Introduction: Several countries adopted population management (PM) to achieve Berwick’s Triple Aim: simultaneously improving quality of care, improving population’s health, and reducing per capita costs. Also in the Netherlands, the concept of PM is embraced. In 2013, the Dutch Ministry of Health designated nine regional innovation initiatives as ‘pioneer sites’ in a nationwide effort to achieve a better health, improved quality of care and cost control (Triple Aim). The National Institute for Public Health and the Environment (RIVM) has monitored these sites with a particular focus on their design, the Triple Aim, and the experiences of members of the steering groups of the sites. In this presentation the development of the sites during the first 1,5 year are presentedMethods: The following information about the pioneer sites is collected each quarter using interviews, published documents and websites: 1) aims of the PM site; 2) structure (legal entity, involved organizations and their roles, governance); 3) risk stratification and population identification; 4) financing and incentives; 5) included interventions; 6) barriers/facilitators. Next to this, sixty semi-structured interviews were conducted, including all members of the board of the nine pioneer sites. Interviewees’ roles varied, but they were mostly directors/ managers of care groups, hospitals and patient-organizations. The interviews focused on barriers and facilitators in achieving the sites ambitions. Additional elaborated themes were: 1) financial incentives/ contracts, 2) quality of care and 3) transparency of information between involved organizations.In addition data on the Triple Aim have been collected by using national registration data on costs (Vektis) and health (Dutch National health monitor) as well as an additional questionnaire among a randomized selected sample of the populations of the nine sites (in total n=5030) identify the quality of care.Results: Health care providers, insurers and often stakeholders like municipalities and ...