The article discusses a new framework called UPSUF that helps cities plan sustainable urban development to protect the environment and infrastructure. The framework uses a systems approach to evaluate sustainability, design solutions, and planning processes. It focuses on addressing water security, energy use, and land management in growing cities like London. By using a Geographical Information System, UPSUF connects design ideas with evaluation metrics to create a more sustainable urban environment. This framework aims to bring together public and private sectors to work together for better urban planning.