Reducing the costly and unnecessary burden of regulations on businesses is a key way government can support business competitiveness as well as attract investment. Yet in most countries, there is no systematic way to review regulations or assess whether the regulations are fulfilling their objective.The Reducing Unnecessary Regulatory Burden (RURB) approach, as pioneered by the Malaysian Productivity Corporation, is one way to address this. This ERIA study looks to see how by applying RURB, problematic regulations can be identified, options to address regulations developed, and dialogue between regulators and business fostered. In this study of seven ASEAN Member States, each country report focuses on a priority growth sector for that country. The results, presented alongside a case history from the sewerage sector in Malaysia, shows the potential of RURB for reducing regulatory bottlenecks if adopted by ASEAN members.rn