Within the scope of the "Strengthening and Supporting the Health System Project" carried out by the Ministry of Health, the "Harmonization of Turkey's Health Accounts System with the OECD 2011 System Project" initiated by the Ministry of Health was completed in cooperation with TÜSSİDE and Acıbadem University Health Policy Implementation and Research Center. In this study, it was aimed to harmonize the OECD (Organization for Economic Cooperation and Development) 2000 Health Accounts System, which Turkey has been implementing, with the updated and expanded OECD 2011 Health Accounts System in order to provide more detailed evaluation, monitoring and analysis of the Health Accounts System in order to ensure financial sustainability in the face of increasing health expenditures and to formulate more cost-effective policies. To achieve this goal, the following steps were taken to achieve the objectives of the project with the participation of stakeholder organizations of the Turkish Health Accounts System:

• An expanded and updated methodology was designed to adapt the existing System of Health Accounts (SHS 2000) to the OECD-recommended SHS 2011.
• In Turkey, the current state of SHS data was identified (data that can and cannot be collected, classified or named).
• The roles and responsibilities of the institutions that provide data to the Turkish Health Accounts System were determined to ensure adequate and comparable data transfer to the SHS 2011 system.
• People who will enter and analyze data into the system have been trained and training manuals have been developed.
• A National Action Plan was developed to upgrade Turkey's current health accounts system, the OECD 2000 version, to the Health Accounts System 2011 (HAS 2011), which has been updated and expanded by the OECD.

In this process, we worked with the main stakeholders responsible for Turkey's data on health financing: the Ministry of Health, the Social Security Institution, the Ministry of Finance, the Ministry of Development, the Turkish Statistical Institute, the Undersecretariat of Treasury, and dozens of other stakeholders who provide or use data.

One of the most useful outputs of this project has been the standardization of data, which is crucial both for the development of Turkey's own health accounts and for international cooperation and data comparability.