People have different development goals that may conflict, such as farmers supporting dams while tribal people oppose them if their land is flooded. Development goals include material needs like money as well as non-material factors like equality and respect. Countries are classified by annual per capita income as low, medium, or high income. However, per capita income alone does not determine development, as factors like health, education, and security also contribute to human welfare and development. Sustainable development aims to meet current needs without compromising the environment or future generations' ability to meet their needs.