Difference between Dependency and World System Theory

The differences between the world-systems theory and the dependency theory are:
(a) The unit of analysis in the dependency theory is the nation-state level, for the world-system it is
the world itself.
(b) Concerning methodology, the dependency school posits that the structural-historical model is that of the boom and bust of nation states, the world systems approach maintains the historical dynamics of world-systems in its cyclical rhythms and secular trends.
(c) The theoretical structure for the dependency theory is bimodal, consisting of the core and the periphery; according to the world systems theory the structure is trimodal and is comprised of the core, the semiperiphery and the periphery.
(d) In terms of the direction of development, the dependency school believes that the process is generally harmful; however, in a world systems scenario, there is the possibility for upward and downward mobility in the world economy.

e) The research focus of dependency theorists concentrates on the periphery; while world systems theorists focus on the periphery as well as on the core, the semiperiphery and the periphery.