- In February 2020 Greece joined the Paris Collaborative on Green Budgeting. Green objectives started to be highlighted in the context of performance budgeting and spending reviews. - In 2021 a working group was established with members from the Ministry of Finance and the Ministry of Environment and Energy. The working group is responsible for developing a timeline with milestones of the reform. It is also responsible for setting the general rules, developing the methodology and defining other parameters of the new system.  - In 2022 the working group further develops the methodology focusing on tagging, while receiving technical assistance from the OECD. A pilot approach of green budgeting in specific programs of performance budgeting is being developed.