Calculated Ambiguity is a policy applied by the nuclear weapon states on negative security assurances given to the non-nuclear states. The goal of these assurances is to guarantee that states that have abstained from nuclear weapons will not be attacked by these weapons. The article demonstrates how these assurances have been watered down since the negotiations of the Non-Proliferation Treaty, the NPT, in the 60s. In "Renegotiating the Nuclear Order: A Sociological Approach" I have applied the

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... sociology of technology" in order to understand the non-nuclear states´ potential policies to counter this trend. As a result the study focuses on states that belong to the nuclear weapon-free zones (NWFZ-states). These states have a treaty-based commitment to a nuclear weapon-free status and the nuclear weapon states are, in a protocol to the treaties, required to confirm this status and to refrain from nuclear attacks. As ambiguity is built into these assurances the article explores a process by which the NWFZ-states, by walking out of a NPT Review Conference, could achieve unconditional guarantees. The case of the "Mexican amendments" from the early NPT-negotiations is selected as a parallel example to empower the NWFZ-states for collective action. Nevertheless, this implies that the NWFZ-states be organized, not only regionally, but also globally. The article concludes with a comment on how these unconditional assurances could form a critical step towards a nuclear weapon-free world.