The dynamic system of social development;

Science and technology is an important driving force for social development. (Strong lever)

Social reform is the direct driving force for the development of the same social form.

Social revolution is the decisive link of social form replacement. (the locomotive of history)

Class struggle is the direct driving force for the development of class society.

Social basic contradiction is the fundamental driving force of social development.

Mode of production is the decisive force of social development.

Productivity is the ultimate decisive force of social development.