States that lack complete control of peripheral regions might be qualified as weak, and previous research suggests that they face an increased risk of state failure. Yet, in the periphery of many states, authority is shared by the government and non-state actors. Far from all these “weak” states are “failed” in the sense of failing to provide services and political order to their inhabitants. Before exploring this enigma, an attempt to clear the conceptual haze surrounding the notions of weakness and failure is made. An investigation into when state weakness leads to state failure – and when it does not – is thereafter undertaken, using a process-tracing method. The thesis explores the structure of state-society relations in two pairs of mo...