This learning event on Socially Inclusive Development in the Urban Sector: The Case of Wastewater Management in Colombo presented how an urban infrastructure in Colombo City, Sri Lanka, was improved through an inclusive approach using a pro-poor and socially inclusive checklist—a standardized tool for a rapid assessment of poverty, vulnerable group, and gender aspects. The tool, which describes certain steps as minimum requirements, also raised awareness among municipal decision makers and sector specialists to understand that pro-poor infrastructure development will improve the local environment, and increase local economic dynamism and competitiveness. The technology aided the preparation of a Pre-Feasibility Study that provided an overall framework to ADB-funded projects for 2015-16 (USD 128 million) by analyzing the wastewater collection and treatment facilities, as well as the management services in Greater Colombo, and provided recommendations for their improvement.