MANY COUNTRIES IN THE ASIA-PACIFIC REGION – including China, India, Indonesia, Philippines, Thailand, and Vietnam – have voluntary greenhouse gas (GHG) mitigation policies and initiatives to help address the causes of climate change and achieve sustainable development. However, alternate development pathways require different policy and technology measures that have varying costs and benefits, so it is critical for countries to identify the most cost-effective and locally appropriate policies and actions to achieve their goals. Several modeling tools have been developed to help governments, researchers, and other stakeholders assess the potential impact of policy and technology options. This case study shows how one of these tools, the Asia-Pacific Integrated Model (AIM), has been used in Thailand to inform policy-making for low-carbon, climate-resilient growth.