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In page Nationally determined contribution:

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NDCs are established independently by the parties (countries or regional groups of countries) in question. However, they are set within a binding iterative "catalytic" framework designed to ratchet up climate action over time.[2] Once states have set their initial NDCs, these are expected to be updated on a 5-year cycle. Biennial progress reports are to be published that track progress toward the objectives set out in states' NDCs. These will be subjected to technical review, and will collectively feed into a global stocktaking exercise, itself operating on an offset 5-year cycle, where the overall sufficiency of NDCs collectively will be assessed.[citation needed]