Like most other things, international organisations are only as good as the results they yield, but there is no denying that they play a central role in international affairs. Their growth, particularly in the twentieth century when the concept of global governance came of age, means that nearly every aspect of life is regulated in some way at the global level. International organisations, in their vast array of forms, complement and sometimes positively challenge the role of the state. Going back to the airport analogy used at the start of this chapter, we may not always be aware of how international organisations affect even the most mundane things in our lives. But, our lives would be materially different without them.