This report illustrates why Southeast Asian countries need big data for recovery from COVID-19 to radically transform the delivery of key services such as health care, social protection, and education. The final of a four-part series, it looks at the impact of the pandemic on Cambodia, Thailand, Indonesia, Myanmar, and the Philippines to determine how big data can help governments analyze the challenges they face. It outlines policy reforms and recommendations to help capture the benefits of big data, including drawing up digital roadmaps, improving technical infrastructure, and ramping up training to create a skilled workforce to lead the digital transformation.