The research aimed to find the best way to plan the costs of building city infrastructure to make cities more sustainable. The researchers used a method called Operations Research to analyze the costs and benefits of different infrastructure options. They found that by planning costs efficiently, cities can reduce pollution, improve public health, and boost the economy. The study showed that investing in urban infrastructure can lead to better economic development in the region. By focusing on environmental, social, and economic factors, cities can become more sustainable by managing their infrastructure effectively.