This research proposes that global governance is a multi-actor oriented system with no central authority and different actors are capable of exercising power and authority. The question worth asking is how different UN entities play their roles and how they affect governance issues. How are these different types of UN agencies able to exercise productive power in world politics? What are the main instruments available that would enable them to be productive? Is there any significant variation when we compare different types of UN agencies, particularly programmes and specialized agencies? The mandate seems not to be enough to explain variations and their capability to exercise productive work in global governance. In this research, I try to operationalize the concept of productive power, focusing on some of the internal instruments that UN agencies use to be productive in governance. This research presents a systematic account of the main internal features and differences between two categories of UN agencies: funds and programmes and specialized agencies; offering important insights to understand better how these agencies use different instruments to create concepts, disseminate ideas and exercise productive power in global governance. Four case studies were developed in this research: UN-Habitat, UNFPA, ILO, and WHO.