Around the world, it is increasingly being recognized that for sustainability goals to be reached, efforts need to go beyond complying with standards and mitigating adverse impacts, to identifying environmental sustainability as an objective of the development process. This approach requires the integration of environmental, sustainability, and climate change considerations into policy and sector reform. Because sector reform brings about significant policy change involving adjustments in laws, policies, regulations, and institutions, it is a sensitive political process often driven by strong economic interests. Policy makers are subject to a number of political pressures that originate in vested interests. The recommendations of environmental assessment are often of little relevance unless there are constituencies that support them and have sufficient political power to make their voices heard in the policy process. While strong constituencies are important during the design of sector reform, they are even more important during implementation. It follows that effective environmental assessment in policy and sector reform requires strong constituencies backing up recommendations, a system to hold policy makers accountable for their decisions, and institutions that can balance competing and, sometimes, conflicting interests.