This Guidebook, which is based on the outcome of a UNEP pilot project that was carried out in three South East Asian countries in 2009-2010 - Cambodia, Lao PDR and Vietnam - is intended to serve as a tool to help decision-makers and legal drafters to incorporate measures for adapting to the adverse impacts of climate change into their national sustainable development policies, plans and programmes by creating the necessary legal, regulatory and institutional framework for such action.