CEVAP:

According to Waltz, in foreign policy of states, either the unit oriented reasons or system oriented reasons might be effective. Waltz asserts that regarding only one of these to analyze the foreign policy and the international politics is not enough. Instead, both should be considered to make right and healthy explanations and analysis. In short he adopts two track analyses, i.e. sometimes system level and sometimes unit level could be taken as an independent variable to analyze the foreign policy as a dependent variable. With his approach, Waltz has been the pioneer of neorealism/structural realism.