All parties are left to establish their own national policy framework to achieve the commitments outlined in such NDCs. Countries are also required to report emissions, with progress reviewed by a 'facilitative, non-intrusive, non-punitive' independent review system against common metrics still to be defined, with flexibility given to developing countries in light of their weaker capacity to collect and report data. They have therefore agreed to convene a 2018 facilitative dialogue to inform the next round of commitments.