Based on the summary of both positive and negative historial experiences and the objective analysis of China's basic national conditions and the world economic situation, Deng Xiaoping has proposed the economic development strategy of realizing modernization in three successive steps. In accordance with the national condition, the strategy emphasizes "being geared to actual circumstances". It embodies the idea of "valuing the interests of the people above everything else". It concerns itself with the coordination between society and population, environment and resources. It highlights the sustainable development.