UNEP has launched a transformation process to become more effective in delivering its mandate, with more operational integration, clarity of focus and learning from past lessons. In this process, the evaluation function in UNEP promotes learning and accountability and is a key sources of credible, timely and evidence-based information and a critical tools for decision-making.

UNEP makes use of a combination of complementary evaluations at different levels that examine different themes. The aim is to provide evaluative evidence on the effectiveness and efficiency of the implementation and delivery of UNEP; identify challenges in implementation; and provide lessons and recommendations to guide the future strategic direction of the organisation and improve programme formulation and implementation.