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Every time the New Zealand government signs a new significant international treaty, a National Interest Analysis (NIA) is produced by the lead government agency. The NIA is then presented to Parliament, together with the text of the treaty, for consideration. The requirements of the NIA are set out in Parliament’s Standing Orders and the Cabinet Manual.
For the CEP upgrade, the NIA was released on 15 November 2018:
An NIA was also written for the original CEP which was signed in 2000: