 Critics argue that Parsons' theory is inexcusably static and lacks the flexibility to meet instances of social change.While Parsons purports that the AGIL scheme is a general theory of social functions that can be applied to any social system at any time or place in the history of humankind, critics contend that it is basically just a model of the post-war United States, or, moreover, merely an ideal social structure of the middle-class of United States.Parsons' defenders argue that such criticisms are misplaced inasmuch as Parsons tried to identify the most important systemic features of any society whatsoever