How does the NSG achieve its aims through the Guidelines?

In the NSG Part 1 Guidelines, formal government assurances are required between the exporting and importing governments to assure that the nuclear transfer is for peaceful purposes and will not contribute to the proliferation of nuclear weapons or other nuclear explosive devices. The importing government also has to provide assurance that it will not re-transfer items, material or technology that it has received to a third government without the exporting government’s prior consent. There is also a requirement for physical protection measures, and an agreement to exercise particular caution in the transfer of sensitive facilities (i.e. enrichment and reprocessing facilities and equipment and technology therefor), technology and material usable for nuclear weapons or other nuclear explosive devices.