They should be defined considering the essential need to engage all parties in credible, flexible, realistic long-term approaches and policies that will evolve based on growing experience and knowledge.
这些框架的制订应考虑到务须使各方参与采取可靠、灵活、现实的长期做法和政策，这些做法和政策将根据不断增长的经验和知识而逐渐形成。