Monitoring and Evaluation (M&E) can be defined as the systematic and objective measurement and assessment of progress and performance of an intervention. A comprehensive system documents activities, outcomes, and impacts
promotes transparency and accountability
and facilitates continuous learning. The system should also evolve, expand, and improve over time to adapt to changing needs, priorities, capabilities and available data. Climate policy evaluation uses data to answer specific questions about the implementation, outcomes, and effects of policy or related issues. A theory-based approach facilitates evaluation of the entire implementation process. Through the development of indicators for each step in the process, it is possible to not only learn which policies are successful or not, but also why they succeeded or failed and how they can be improved.